Just rebuilt my system and the only bits not replaced are the SATA HDD. DVD Writer and the PSU, this was due to it going into major sulk mode. OK, the problem is this. When I boot up as normal with no bootable disk in the DVD drive and the BIOS boot sequence set to HDD first, it hangs just past the BIOS Post screen and won't advance any further (just a blank/black sceen with no cursor). If I change the boot order to DVD first and have a bootable disk in, it gives the option of 'press any key to boot from cd', I let it continue without pressing anything and it loads with no problems at all! Never come across a scenario like this before, so any ideas on why, or how to fix it would be gratefully receieved.