i usually check these forum for solutions so i decided to ask a question here. this was my setup: asrock z77 pro4, i5 3570k, crucial ballistik 8gb 1600 lvp, 64gb ssd, 500gb hdd, nvidia 650 gtx ti and raidmax 630w psu (semi modular). i unplugged the tower to clean it(sentey optimus case). i got a message when powering up after stating that the cmos needs configuring. this has happen to me before and this time i checked the cmos battery and it was 3v. i configure cmos to get my fan speed to quiet but efficient. however, i smelt something burning after the 3rd restart while the pc was in window, then it lost power. it tried to reboot but nothing getting power. i tried another psu but still nothing. i bought a cheaper mobo and it booted to bios with old psu. i tried the raidmax and it booted to bios also. i'm still to connect hdd etc. however, i was wondering is the psu trust -worthy after the mobo was fried? i didn't smell any burn from the psu though. thanks for your replies