Weird power pulsing problem

[belveder]

This morning my second computer started playing up, it seemd to have no power, even the fans could only run at very slow speeds.

I thought the PSU was faulty so I put a spare Thermaltake 750 watt PSU in. Now when I turn the power, the lights and fans seem to pulse and nothing else happens.

I have tried it without any cards or accessories with no luck also checked the memory

Any help would be greatly appreciated

 

[LordOfLA]

First thing I'd check for is a short somewhere.

 

[Dark Atheist]

bad motherboard me thinks

 

[belveder]

I thought so as well, but hoping not lol

 

[belveder]

First thing I'd check for is a short somewhere.

I have, by unplugging all the power leads that come from the PSU, taking out all cards including Video card

 

[dreamliner77]

Also, try reseating the headers for the power and reset buttons from the case.

 

[belveder]

Just tried it on your suggestion, no difference, thanks anyway. This means that I have disconnected / unplugged every single plug on the mobo now. I'm think the mobo must have bit the dust?

 

[LordOfLA]

disconnect all your devices too. I'd suggest sliding optical drives forward to ensure no contact.

All you should have to power on is a bare motherboard (no cards, no ram, no devices plugged in. Then use a flathead screwdriver to turn the power on. If it still pulses take the board out the case and try it again.

If it still pulses you want a new board.

 

[belveder]

Thanks but I already said I did that.