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Power cuts out almost immediately after pressing power button

Last response: in Components
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May 29, 2011 12:24:14 AM

My computer recently started shutting down for no reason. :pfff:  The situation in the link below, is virtually the same except, I never removed the PSU so, I know it isn't upside down. Also, Prior to the present situation, the PSU was never a problem. :D  I have tried two different power cords, two wall outlets, and one outlet on the surge protector. :??:  Semi-consistently, I get no power or, when I turn on the computer, it shuts down almost immediately. :fou: 

Any ideas?

a c 141 ) Power supply
May 29, 2011 12:31:47 AM

Check:

1. Is 8 pin EPS / 4 pin ATC cable plugged in by CPU ?
2. Is CPU fan plugged in spinning ?
3. If that doesn't help, remove and reinsert all cables, cards, RAM
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a c 1200 ) Power supply
May 29, 2011 12:58:45 AM

What is the make and model of the computer or its components? How old is it?
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May 29, 2011 3:53:10 AM

ko888 said:
What is the make and model of the computer or its components? How old is it?


The computer is self-made i.e.

1. Mbd-SOYO 7VBA133U(2001)
2. RAM-1GB(2010)
3. Video-ATI Radeon 9600SE(2001)
4. Monitor-LG Widescreen 1900x1600(2010)
5. Sound-Soundblaster Audigy 2ZS(2004)
6. Speakers-Logitech 200W(2004)
7. Keyboard-Logitech 134-key USB(2010)
8. Mouse-Logitech 3-button(2010)
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May 29, 2011 3:59:46 AM

JackNaylorPE said:
Check:

1. Is 8 pin EPS / 4 pin ATC cable plugged in by CPU ?
2. Is CPU fan plugged in spinning ?
3. If that doesn't help, remove and reinsert all cables, cards, RAM


"plugged in by CPU?"? Do you mean, is the location of where the 8 pin EPS physically connected located next to the CPU? If that is what you mean, the answer is no.

The PSU fan is spinning.
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May 29, 2011 6:43:03 AM

You need to connect that 8pin connector what JackNaylorPE told you
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a c 1200 ) Power supply
May 29, 2011 7:56:44 AM

If the Soyo 7VBA133U VIA Socket 370 ATX Motherboard has only the 20-pin ATX power connector on it where are you going to plug the 4-pin/8-pin 12V EPS power connector to?

Pentium III/Celeron CPUs never drew enough power to require a 12V EPS power connector on the motherboard.

What is the make and model of the power supply unit? They do lose their capacity to supply their labelled power output over time.
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a c 126 ) Power supply
May 29, 2011 6:05:47 PM

Clean the dust out of the CPU heat sink and out of the PSU (as best you can).
I just worked on an equally ancient PC (old Compaq P3) this weekend; funny that the PSU has only a 20-pin connector, and a mere 3.5A on its +12V rail! Fortunately the PSU was not the problem, and nothing else was dead in it.
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May 29, 2011 10:09:38 PM

Onus said:
Clean the dust out of the CPU heat sink and out of the PSU (as best you can).
I just worked on an equally ancient PC (old Compaq P3) this weekend; funny that the PSU has only a 20-pin connector, and a mere 3.5A on its +12V rail! Fortunately the PSU was not the problem, and nothing else was dead in it.


I have been thinking of the dust since you mentioned it. I have kept the case open for a long time, so as to have easy access to the individual parts. At the same time, I have been thinking about getting rid of the dust. My only curiosity about it is, will a simple can of air do the trick or, is there something better than that?

When it is working(like right now), I noticed that the RAM is 100% fine. Which also means the mobo is essentially fine and, the video card is fine. Because outside of the PSU, any one of those three would keep the computer from booting or, there would be an audible error code before shutdown.
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!