Start with these free diagnostics:
Please start by running these bootable hardware diagnostics:
http://www.carrona.org/memdiag.html (read the details at the link)
http://www.carrona.org/hddiag.html (read the details at the link)
Also, please run one of these free, independent online malware scans to ensure that your current protection hasn't been compromised: http://www.carrona.org/malware.html (read the details at the link)
Then, if the above tests pass, I'd try these free stress tests:
FurMark download site: http://www.ozone3d.net/benchmarks/fur/
- If you have more than one GPU, select Multi-GPU during setup
- In the Run mode box, select "Stability Test" and "Log GPU Temperature"
Click "Go" to start the test
- Run the test until the GPU temperature maxes out - or until you start having problems (whichever comes first).
- Click "Quit" to exitPrime95 download site: http://www.mersenne.org/freesoft/
- extract the contents of the zip file to a location of your choice
- double click on the executable file
- select "Just stress testing"
- select the "Blend" test. If you've already run MemTest overnight you may want to run the "Small FFTs" test instead. (run all 3 if you find a problem and note how long it takes to error out with each)
- "Number of torture test threads to run" should equal the number of CPU's times 2 (if you're using hyperthreading).
The easiest way to figure this out is to go to Task Manager...Performance tab - and see the number of boxes under CPU Usage History
Then run the test for 6 to 24 hours - or until you get errors (whichever comes first).
This won't necessarily crash the system - but check the output in the test window for errors.
The Test selection box and the stress.txt file describes what components that the program stresses.