I've been having variations of this problem for a while now and to this day the solution eludes me.
It happens a majority of the time- but not always- I boot the system and it runs up to the desktop. After a few seconds, the monitor loses all signal from the computer and my rig starts making horribly loud sounds I can hear from down the hall! No solution after that but force shutdown.
Originally I had a similar problem but the system never even got to the boot stage.
Worst part is, nobody seems to recognise or even know of a similar issue.
