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Old 02-08-2011, 02:47 PM   #1 (permalink)
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Default Power Problem

I have a comp that has been running strong for a couple of years and not has decided to stop working. While running a random game the screen went blank. I rebooted it but it wouldn't boot anymore. I had had some issues with the power supply in the past causing it to not boot up so I checked it again. At this point it wouldn't even power up. I figured the power supply ate it so I ordered a 450 watt one from newegg. When it arrived it didn't change anything. After playing around some the original power supply will power up ONLY when I have just the 24 pin connector connected and not the 4 pin JATXPWR2 plugged in however it still wont boot. Does this sound like a bad motherboard and/or CPU?

Also I tried the new power supply on another build and it doesn't seem to work on that one either. I even tried jumping the power wire and grnd but nothing. Any ideas on that one? Sending it back for a replacement costs almost as much as the ps.
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Old 02-08-2011, 03:25 PM   #2 (permalink)
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Default Re: Power Problem

Does the original power supply work fine in the other build? If so I would guess the motherboard. Unhook all the expansion cards and unnecessary drives and see if it boots. I had a bad 8800GTS causing similar issues in the past.
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Old 02-08-2011, 03:32 PM   #3 (permalink)
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Default Re: Power Problem

I took everything out and tried it but it does the same thing. Seems to revolve around the 4 pin power connector. It will power up but not boot if I disconnect it.
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Old 02-08-2011, 04:09 PM   #4 (permalink)
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Default Re: Power Problem

What is your PSU brand? Try reseating your CPU. It helps sometimes.
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Old 02-08-2011, 04:48 PM   #5 (permalink)
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Default Re: Power Problem

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Originally Posted by Docskyhawk View Post
Also I tried the new power supply on another build and it doesn't seem to work on that one either. I even tried jumping the power wire and grnd but nothing. Any ideas on that one? Sending it back for a replacement costs almost as much as the ps.
Did you try jumping the old psu? Also did you check your motherboard for burn marks, leaking or burned capicitors?
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Old 02-08-2011, 05:18 PM   #6 (permalink)
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Default Re: Power Problem

Hmmm there are two Caps that look burnt. I'll replace and see what happens. They are near the 4 pin power connector too! I didn't even think to check those...
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Old 02-08-2011, 05:26 PM   #7 (permalink)
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Default Re: Power Problem

Can you take a picture of it?
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Old 02-08-2011, 07:22 PM   #8 (permalink)
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Default Re: Power Problem

I replaced the bad caps but it didn't solve it. It seems there is another short in that area but I can't locate it. I guess I will chalk it up to an old mb. I'll give it a proper funeral......

How about the defective new power supply...any ideas why it wont power up? I've tried two mb and jumping the power wire and ground but nothing.
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Old 02-25-2011, 10:54 AM   #9 (permalink)
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Default Re: Power Problem

Hello there. I have a MoBo/PSU problem as well. My specs are as follows:

300W PSU
socket 478 board
Celeron A 2.66 GHz
3 IDE HDDs (Maxtor x1, Seagate x2)
128 MB ATI 9250 PCI graphics card
LG burner

The reason all of this sounds, and *is* old is because I live in Cuba, and I can't really afford the 775 technology. Not yet, at least. So, long story short, I get home from the faculty, go over to the PC, stick my finger into the back-up's switch, and... *BANG!* That's what I heard. Thinking "What the...!?" and "Oh, sh..." I try to turn the PC on, but obviously to no avail. So seeing how the back-up was still on, and the PC itself was off at the moment, I chalk it up to the PSU, and take it to a friend of mine, who has saved me in previous occasions, for a check up. Three days later (yesterday, 24th) he tells me it's OK. But when I get home and mount it back, still nothing! I tried dismounting everything from the 'board, and I do mean *everything*, but the CPU, even tried exchanging said CPU for my previous 2.4GHz, and still nothing. Everything seems fine, both visually (no burns, leaks, swollen filters or otherwise suspicious-looking elements) and olfatory (meaning nothing smells burned, or anything). Any ideas/suggestions/anything? I'm about to give up. Help, please.
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Old 02-25-2011, 12:11 PM   #10 (permalink)
 
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Default Re: Power Problem

Bang is usually a psu...

You need to try to jump the psu yourself... really easy to do.

How To: Jump Start A Power Supply (PSU) / Test A Power Supply And Components - Overclock.net - Overclocking.net

Just to be sure.
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