The PC I recently built for my cousin has developed a fault. When she powers up, sometimes there is no beep, no monitor, no nothing, although the power is obviously there as the fans are all running. She then hits the reset button, and everything boots up OK. This started happening on odd occasions, but apparently it is starting to increase in frequency. Any ideas? I thought initially this was just the monitor not firing up, but now it seems it's more than that. Would going into the BIOS and disabling Quick Boot (if it's enabled) have any effect?