The problem has only occurred during gaming. The three games I've seen it happen on are osu, Minecraft, and The Sims 3. The games run completely fine, even at highest settings. Without warning, the computer does as described in the title: It becomes completely unresponsive, the last sound playing loops briefly then stops, and the screen continues to show whatever was last on it. My only solution is to turn the computer off and then back on.
The specs are:
- Windows 7 64-bit
- A785GM-M ECS Elitegroup Motherboard (Which has built-in Radeon 4200 GPU)
- A discrete Radeon 5450 GPU
- Athlon X3 at 3.0 (Not unlocked or overclocked yet)
- 500GB Harddrive
- 550 Watt PSU
- 4GB RAM
I've run memtest, ruling out any sort of memory problem (not that I really suspected one anyway). I often have many things running, but as stated before the games run fine so I don't believe stress is an issue.
Personally I believe the machine either needs cleaning, the PSU isn't providing enough power under stress, or the Discrete GPU is defective.
I will be cleaning the computer out today, but because the freezes are random I can't definitively prove if that solves the problem in any short amount of time. So, before I consider buying a PSU or GPU (both relatively expensive items, though my GPU is still under warranty I believe) I ask for additional opinions on the matter.