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Reapply thermal paste to the CPU
If your computer started crashing after you had installed a new CPU, this could be a result of a poor application of thermal paste. .
Remove the heatsink carefully, clean the surface with a cotton ball and alcohol to remove the previously applied thermal paste, and reapply a new one.
The thermal compound fills the microscopic valleys on the surface of the CPU and heatsink in order to provide full contact between the two components (heatsink and CPU) and to decrease the CPU temperature.
This tutorial should help you if you are not sure how to apply thermal paste: Desktop: Laptop:
Note: Buy an UNPACKED thermal paste (compound) from a computer store.