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Really annoying power problem

Hi all, I hope someone can help me here.

I have had a problem with an old PC for a while now. Basically one day it wouldn't boot up....I had power but nothing else. CPU Fan and Graphics fan worked. No Beeps. No power to CD / HD drives.

The other strange thing is the power supply switch now powers up the PC, i,e the front switch does not need to be pressed.

I have tried another working PSU. Swapped RAM, Swapped CPU to no avail so I decided as I was getting no beeps it must be the motherboard.

I have just installed a new board (exactly the same model) and I have exactly the same problem.

The PC still powers up fans but nothing else. Any ideas what this can now be??? I;m struggling big time. I have disconneced the from panel sw / led and it's still booting up!!!!

Please help.

For info this is a MSI Socket 478 Mobo, P4 2.6, 250W PSU.

Hoep this is enough info for you guys.


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At 250 Watts.

In reply to: Really annoying power problem

That size power supply could have been working at near it's limit for years.

Why not swap that or MEASURE all the rails with a Volt meter?

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Swapped for 350W

In reply to: At 250 Watts.

Hi, thanks for the reply. I swapped the 250W PSU with a 350W. I have just tried it again and noticed the switch on the front panel is now working as it should (?!) however just the fans again are powering up. Could 350W also be a bit low?

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How I test for that.

In reply to: Swapped for 350W

I use my DVM (digital Volt meter.) Your method is the usual method and I can't determine if that 350W PSU is good or bad without my DVM.

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