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Author Topic: Help, my computer stopped working and I can't power up!  (Read 7755 times)
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VWBug
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« on: July 18, 2009, 05:52:06 PM »


In the middle of an on-line game, my computer (1 year old) suddenly stopped... instantly - no power.  There was no warning of a problem and it's worked fine since I built it w/my son.

I tried different plugs and outlets and have seen or heard no signs of life.  Would it be safe to say it's the power supply (Corsair 620 modular) or are there other possibilities.  A few weeks ago I added an Hitachi 1TB drive - the only recent change.

I've emailed Corsair and will probably hear from them next week...

A good part of my day is on the computer and I'm going just a little crazy having to use my wife's "rig" for my online source (and it's only been a day)!
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Chaz
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« Reply #1 on: July 18, 2009, 06:26:46 PM »

This will likely be very little help, but I had a similar thing after a power outage a year and a half ago.  I tried a number of things including swapping power supplies, and never really figured out the problem.  My guess was that mine was the motherboard, since I never got any kind of response from the power button (which routes through the MB). 
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Laner
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« Reply #2 on: July 18, 2009, 06:56:03 PM »

Check your motherboard and see if you have any blown capacitors

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heloder
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« Reply #3 on: July 18, 2009, 08:09:54 PM »

If it's the computer and not the surge protector you have it plugged into (make sure you hit the reset button on that in case it got tripped) then it pretty much has to be either the PSU or motherboard.
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TheAtomicKid
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« Reply #4 on: July 19, 2009, 12:43:58 AM »

Since you've tested it on other, presumably working, wall sockets, we can assume it's not the wall power itself. Surely you'd notice if multiple outlets were not working.

If you haven't yet, be sure to test it without the surge suppressor, just to be sure that's not the culprit. If you've checked and verified it's working, ignore this. (note that they can continue to work with very light loads in some cases, but a heavier load will cause them to fail)... basically, check the computer directly to the wall socket, temporarily. If it works there, you have your culprit (the power strip).

Given the way the computer goes together, etc, you have three possible culprits at this point. The PSU (easily tested, either in another computer, or bringing a known good psu into the current computer). The motherboard. (not so easily tested, but if the PSU works in another computer, your possible list of suspects has shrunk) And finally, it could be the cpu itself.

So, if you get to this point, the easiest step here, is to move the suspect psu to another computer, and see if it functions correctly, there. If it does, you're down to two suspects, both of which are a minor pain to sort out and verify.

It's possible you blew an internal fuse in the psu... a short inside the case can easily do this... if it's a year old.. how dirty is it? (try cleaning out the psu if it's noticeably dusty.. I've revived 'dead' computers this way.

Atomic

PS: Can anyone remember if current boards will even try to boot without a cpu present? Do they give audible alarms like if you say, don't have a graphics card plugged in? Or do they pretend they're dead? I haven't tried one this way in a long long long time.
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ROTC1983
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« Reply #5 on: July 19, 2009, 12:58:20 AM »

AtomicKid....not sure if they still make audible noises if a CPU is not plugged in.  What model is the motherboard?
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Daehawk
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« Reply #6 on: July 19, 2009, 05:15:07 AM »

I was sitting by my computer a few years ago and not actually using it when I heard a small POP and smelled the burnt wiring. the power supply bew. i got a new one but it still would not work. After some help on here and OO i think it was I found the capacitors on the mobo were also popped frown
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VWBug
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« Reply #7 on: July 19, 2009, 01:39:49 PM »


Here are the main components of my machine...

1 Intel Core 2 Duo E6850 Conroe 3.0GHz LGA 775 65W Dual-Core Processor Model BX80557E6850
3 mushkin 1GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Desktop Memory Model 991527
1 CORSAIR CMPSU-620HX 620W ATX12V v2.2 and EPS12V 2.91 SLI Certified CrossFire Ready 80 PLUS Certified Modular Active PFC Compatible
1 GIGABYTE GA-P35-DS3L LGA 775 Intel P35 ATX All Solid Capacitor Intel Motherboard - Retail
1 EVGA 512-P3-N802-AR GeForce 8800GT Superclocked 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card

Thanks for your responses... I did try to go directly in a wall socket and even swapped cords.  I did not see anything that appeared blown on the motherboard (thanks for the picture).  I am borrowing a power supply tester this week.  The inside of the machine is clean but I'll take another look at the CPU.
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TheAtomicKid
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« Reply #8 on: July 19, 2009, 08:11:08 PM »

You could also try booting it with no video. If it starts howling at you, you've got good odds on your suspect component... at least one of them.

Atomic
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VWBug
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« Reply #9 on: July 21, 2009, 12:27:23 AM »


Update...

Removing video had no effect... eliminating that from the list of possibles.

Removed power supply and tested it with a power supply tester.  This confirmed a dead component.

Checked in with the USPS and the package is on its way across country to California.  It should arrive in a couple days.

Haven't done any gaming for over 2 days... so far I've been busy, but need a fix soon!  paranoid
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VWBug
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« Reply #10 on: July 29, 2009, 04:28:56 PM »


Update:

Newegg had a sale this week on the Corsair 750 powersupply for $109 w/a $20 rebate.  Knowing my 620 was delayed, I ordered the 750 on Monday, received the new PS on Tuesday - nice...

Now, my machine has power, fans are running etc. but it doesn't even try to boot - no video showing at all, no sound of startup (beeps, drives).

I tried removing RAM and video card to isolate what might be a problem... no change.

My son's coming this evening to check it out; hopefully I plugged something in incorrectly - but can't say for now. 

Any ideas on how to troubleshoot and find out what's causing the problem now???

Thanks for your input.


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TheAtomicKid
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« Reply #11 on: July 29, 2009, 07:12:02 PM »

Ugh. Well.

It'd be nice if you could test the video card in another machine, and verify it without having to replace it.

If it won't even try to boot with no ram/no video, you only have two components left...

To verify... you've pulled EVERYTHING from the board at this point. Motherboard/cpu only... and though the fans come on, it doesn't beep at you or otherwise complain, when you power it up.
(apologies, I didn't specifically mention this before.. but yes. disconnect everything. drives, dvd, etc. Try to boot with only motherboard/cpu/ram... it should beep and howl at you from the pc speaker if it's functioning correctly... video error from not having a vid card installed... if it does, throw in the video card and check with that. If it continues to function, slowly start adding back components one at a time, until it stops functioning again, or you're back to normal)

I'd double/triple check everything, and then very carefully consider replacing motherboard and/or cpu.

Technical note: If you replace the cpu first, and it doesn't succeed, the return period on cpu's is usually very short. That can be good, or bad, depending on your goals. If you have to socially engineer the expense to say, a wife... 'I can't return it, honey' is a perfectly valid excuse... at least once... and once is all you need in this case smile She'll be mad, but you'll have the new cpu smile

In other words, you might want to try replacing the cpu first, and then, if/when that doesnt succeed, follow up with the motherboard itself. However, it sounds like you ate a power surge... (psu dead, motherboard and/or cpu dead), in which case there's good odds both components need replacement.

Just pray the video card survived.

Triple check EVERYTHING before spending money.

Atomic

recommendation for direct replacement of your mobo... http://www.newegg.com/Product/Product.aspx?Item=N82E16813128359
however, for 19$ more, you can get it's slightly bigger brother, the UD3P, http://www.newegg.com/Product/Product.aspx?Item=N82E16813128358
with your nvidia gpu, no great advantage, but it gets you a second pci-e slot for... whatever you want to stick in it, and a second network port, which can come in handy.
These are _extremely_ solid boards, and I recommend them to anyone considering a purchase in that category. I use the UD3P myself, and I've never had a better, more reliable, motherboard.
« Last Edit: July 29, 2009, 07:17:54 PM by TheAtomicKid » Logged
dmd
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« Reply #12 on: July 29, 2009, 08:34:43 PM »

I had similar problems with a GB board, ended up rma'ing  for one that worked. 
Here's some stories from buyers at newegg that should sound familiar.  I've read that QA for Gigabyte started lacking over the past year. 
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VWBug
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« Reply #13 on: July 30, 2009, 12:40:38 AM »


Up and running!

UPS arrived this evening with a "surprise" delivery - a brand new replacement (full package - wrapped) for the 620.  Corsair had not alerted me of the shipment.

When my son checked my handiwork, he found that I had not supplied power to the CPU  eek - even though its cooling fan was running (from the motherboard).  He ended up pulling the 750 (for a few reasons) and put in the new 620.

Fortunately my fears of further damage to other components seem unnecessary (on initial test)... However, he did say that my case fan seemed sluggish and recommended a replacement.

Thanks again for all the detailed information and assistance. 

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TheAtomicKid
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« Reply #14 on: July 30, 2009, 02:20:08 AM »

Ahh, the old 'didn't plug in the cpu power connector' trick. Does the wife know yet? You could still get a cpu upgrade out of it... smile

Atomic
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