Since yesterday, every time i do a cold boot, the system won't post at all, the screen yust stays off and pc does nothing. I then have to shutdown, turn off powerbutton of the power supply at the back of the pc, and then restart. After that the issue is gone untill the next cold boot. I have an asus P5B mobo with dell slic 2.1 and matching cert + SLP key. Since post doesn't occur, i'm pretty convinced it's a Bios issue, but could it have something to do with it being modded ?