There is definite indication of a power problem in the original post.Mouse and keyboard work,nothing else.The last psu I replaced had only the case exhaust fan working.When bench tested,that was the only rail working and to be fair,the psu was 12 years old.No one can be dogmatic about computer problems,the introduction of win10 proves that,Either substitution or test will positively prove or eliminate the psu.It is simple to do.
The PSU needs to output the correct voltages under load on all rails and the +5V standby circuit and power on control circuit needs to operate properly. The PSU should generate a +5V standby output to the motherboard at all times when the PC is off and the PSU is turned on at the mains. Pressing the PC power on button causes the motherboard to send a power on signal to the PSU (derived from the +5V standby power line). The PSU should then respond by outputting the correct voltages on all rails and sending a Power Good signal to the motherboard when the voltages have stabilised - this usually takes 0.1-0.5 sec. The motherboard will not power on the PC until it receives the Power Good signal from the PC.
I've had two XFX PSU's fail by having faulty +5V standby circuits. There was initially a long delay before the PC would respond to the on button when the PSU was turned on and it eventually stopped working altogether.
See the links on this page for more information http://www.pcguide.com/ref/power/sup/func.htm
Swapped in the new psu with the cables it came with and same results. No fan spin, no beep, seems like it's it getting any power at all. Just worked 11 hours so I'm going to get some rest. I'll try with just the mobo, cpu, and ram in the morning.
I once faced this issue, and resolved after repairing the OS by recovery disk. If you able to boot into bios use that method.
If you are unable to boot into bios , this issue is may be associated with hardware(most probably motherboard)
If this works, you may have a faulty motherboard. Connect just the motherboard (with CPU & RAM) to the PSU and monitor & keyboard to the PC. Check the lead from the PC On button to the motherboard is secure. You should be able to power on the motherboard, enter the BIOS and check settings. If this doesn't work you have a major motherboard fault or perhaps the On button connection isn't working. Some motherboards have a reset button on the motherboard - try that.
If the PSU +5V standby circuit works, you can turn on the PSU with the paperclip test and you are sure that the PC On button circuit is working then it's likely you have a major motherboard fault. If so, this is bad luck since you probably need a new motherboard, CPU & memory and maybe issues activating Windows 10 depending what type of licence you have. Good luck!
Last edited by Steve C; 06 Dec 2016 at 03:09.
Tried just the cpu, mobo, and ram. I used the EVGA jumper and the psu is working fine. I did the paper clip test on my previous psu and it would spin for a second then die. Still, mobo is not booting at all.