System boots as soon as power cable connected

[dajo]

I actually have this problem occurring on two different systems now - one is an old socket a I was using for testing components to sell, and the other is my main rig, a vnf4.

As soon as I connect the power cable to the psu the system boots, I get a boot beep like nothings wrong, fans spins as do hard disks, but no video signal. As stated, one is a socket a with an 1Gig Tbird and the other is a vnf4 with an AMD 3200+.

Any ideas? I'm about to replace the vnf4 today but would rather get it up again and save my bucks for the next upgrade down the line.

Thanks!

 

[luky]

I saw such behaviour with one of my old boards. Problem was that bottom of the board was touching a conductive materiql and as result some paths got shortcuted. Make sure that your board is not sitting on the case backplate. Best way is actualy to take it off the case and run it hust on a table

 

[GuitarDaddy]

Yeah, it either has to be the mobo is shorting out to the case, or the on/off/reset wires aren't properly connected to the motherboard pin outs. Kind of strange you've got it happening on two systems?

 

[NotquiteanooB]

Possibility you have either the Bios set to turn on (restart) after power fail; or your power setting is to restart after power fail. I had a bitch of a time trying to get rid of that from a friend's PC. Found it had been originally set up as a server and was to auto-restart after the power recovered.

 

[Rock Hydra]

Do you have a switch on your Power Supply to cut the power when you disconnect the cable.