I've started having problems booting up my computer. The other day it just took longer than usual, but today I had to turn it off and back on again. I don't think it's getting past the hardware initialization, because my external drive audibly spins up when I start the PC. Additionally, my keyboard didn't light up until it successfully started. Does this sound like a PSU failure, or more likely the motherboard? Specs are: Corsair HX620w PSU Gigabyte Z77-D3H Motherboard (With the beta BIOS; has been stable this past year) Intel 3570k, no overclock MSI GeForce 970 GTX 2b 8gb Corsair RAM. Not sure of the specific model. Two HDDs, Two SSDs. All seem to be functioning. I'm going to reboot and run a memory test, see if that shows up anything. Will also see if there are any problems during a warm-boot. [Edit] Memtest found no problems. There also didn't seem to be any problems during the reboot.