I have been having problems for a while with my current PC. Although there are a few different issues I believe they are all caused by a single problem:
1) Window Media audio exhibits random pops and bleeping.
2) Strange compression artifacts in TMPGEnc video conversions (MPEG-1 and 2) Example image: http://www.geocities.com/avp_knite/problem1.gif
3) 3D graphics are simply not rendered correctly. For an example of this see: http://www.geocities.com/avp_knite/problem2.jpg . Note that this image is a mild case, and graphics seem to tear and warp all over the place. This is abundant in 3DMark and occurs with less frequency in actual games, except Doom 3 which is rendered completely unplayable (sob!).
4) CPU fails tests in CPU check software (but this does not necessarily mean it is the CPU?).
I have a feeling it is either the CPU (an AMD XP2400+), the motherboard (MSI KM4M-L) or the RAM (256MB 333MHz DDR), but I don't want to fork out any cash unless I know I am replacing the correct component. Ideally I would like to be able to fix the problem(!). I have tried clocking the RAM down to 266MHz to match the CPU frequency but this does not help. The CPU runs a little hot, about 60C, but I have read that MSI motherboards are known to do this, and the temperature only reaches about 65C when under stress. The PC does not crash outright so I don't think the CPU is overheating.
I have been pulling my hair out trying to sort this out, so if anyone has any suggestions or has had a similar experience I would appreciate it if you could let me know!