|Did you remove the CPU fan completely to clean it? Sounds a lot like hardware (maybe something wasn't put back together properly) or heating issue. If you removed the CPU heatsink, you are going to need to remove and reapply thermal paste, as likely the issue you are having is due to CPU overheating and shutting down. |
For reference... HP 635 Disassembly guide: http://www.hp.com/hpinfo/globalciti...
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