(FIXED) Seeking PC help from system building gurus

[Zac67]

PSU is ample for that machine. I'm running a 340W Chieftec w/ Athlon IIx4 95W, 3 GB, 4 HDDs, GTS450 (106W) + some PCI cards -- full load (synthetic) on GPU and CPU makes the PSU buzz a little but the system's stable.

Now that you seem to have found the problem: didn't you try with disable sound before? :elvis:

[Zac67]

Radeons require an HDMI sound driver for the UAA part: http://sites.amd.com/us/game/downloads/Pages/radeon_xp-32.aspx#3 - w/o it I never had any problems but a driverless device in DM.