I have a PC that was experiencing random freeze ups so I attempted a complete reinstall using the OEM image disks. The strange thing is the PC would seem to freeze up at random points in the install. I figured it was a hardware issue, so I laid the case on its side to inspect the hardware. I removed the single RAM stick, re-inserted it and tried the install again, but left the computer on its side to look / listen for any strange noises or smells. The install completed without issue and I ran a PC stress test / burn in to try and force a hardware issue to show. After running the test for a few hours there were still no issues or errors reported. After this I took the PC back to its original owner and set it up in the normal position to run the software updates. To my surprise the machine locked up solid again. I haven't attempted the software install with the PC in the laying down position, but it would almost appear that the machine doesn't like to be standing up. Has anyone ever seen this issue, or heard of a PC that has problems when it is standing in the normal position ? Update PC ran fine for 12 hours and installed updates without issue with it laying on the side panel instead of standing up. This thing has got me, any ideas on what could be causing the machine to freeze when it is sitting in the normal upright position ?