Very weird PC, auto turn on and no post?

demonseedboy

Reputable
Apr 8, 2014
4
0
4,510
okay. so after deciding to build a pc out of spare parts in a cupboard:
FX 6100
8GB of ram
asus m5a 78l-m lx
GTX 760
and an atrix 650w psu
after putting all the pieces together the PC starts automatically when plugged in and ignores any signals from the front i/o. shorting the power pins does nothing either, however when you plug devices into the mobo the PC does not give power to the devices or post. the CPU fan sounds like it is running at max speed too.
 

demonseedboy

Reputable
Apr 8, 2014
4
0
4,510
I've just tried it with a spare power supply, the motherboard light shows it is plugged in but refuses to react to having front panel buttons pressed or to shorting the pins that turn it on. I then plugged in the powersupply that I was using for it and it turns out the powersupply is running even when the 24pin has nothing to be plugged into or nothing to jump the green and black cables.