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System running very slow CPU or Motherboard issue?

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I have been attempting to repair my cousins desktop PC and have run out of ideas to fix this. This issue was cause by one of two possible things I believe:

1. My cousin had a electrical issue where one electrical post fried off his electrical meter and his house was only receiving minimal power.
note: I assume the PC should be safe since it was in a plugged into a surge protector at all times however this could possibly be related.

2. When he built the computer somehow his heatsink became unseated one day and the system may have reached high tempature.
note: I am guessing this is the culprit in this situation.


The Problem

The system remains frozen on the windows loading screen for about 15 minutes before booting into windows. Once Windows is loaded the system works however everything takes minutes for tasks to complete instead of seconds. Once a window/program has been loaded windows can be switched with no delay. The system even freezes when trying to reinstall windows. Also just to add when the system is frozen graphics and the mouse pointer do not freeze.


Thing's I've tried
  1. Re-seated everything Motherboard / cpu / heatsink ect..
  2. Shuffled Memory sticks around trying all possible combinations.
  3. Ran memtest+ with no errors logged
  4. Tested all hd's with no errors logged
  5. Replaced Cmos battery
  6. I tried testing the processor using Ultimate Boot Cd's tools however it gives me errors when trying to run the test program so the processor tests have not been done. I've made multiple copies of the cd and verified that it worked on 2 different other pc's.
  7. Re installing windows / System freezes
  8. Using a working hd with working win 7 on it from a different pc / Same Issues

My Conclusion: At this point its hard for me to conclude which component is the culprit... I assume the hd's, memory and gfx card are not related because they work perfectly fine in a different system.

Question: Would it likely be the Motherboard or the processor causing the issue?

Question: What would be some simple tests to run to rule out one or the other?

Thanks in advance for all the help regarding this issue.

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