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I would look for the CMOS reset jumper on the motherboard, if there is one, and while PC is off take of the jumper, then put it back in place. But the more easier option is to just simply remove the CMOS battery from the motherboard, unplug PC completely first, leave it out for a few seconds, then replace it. If that works, you may come across some operating system start options to start the os, depending of what version you have make sure you select the Delete sleep mode data/hibernation data(something along those line), and start OS normally. By the looks of it you've tried everything possible, but last resort would be to try the resetting CMOS/removing CMOS battery. If all fails, try testing using a different power supply.
remove first the power suppy. if it is 24pin power suppy, shorten pin 15/16. that is the black and green, if the fan of power supply rotates, then the P.S. is ok. then return it to motherboard. check your connection with the motherboard power switch. good luck
it seems to be an issue with the power supply as you already tried replacing the motherboard
power supply will be less expensive do try to get it replaced first
do check that monitor iss fine
unplug the blue VGA cable which connects your monitor to the tower
if a 4 colored box moves all over the screen the monitor is fine
and if it doesn't
get the monitor either repaired or get it replaced.