HP Pavilion laptop has been running flawlessly for 3 years. Starting in April (2014) the machine started locking up randomly. By locking up, I mean completely: ctrl-alt-del does not work, the only way to restart is powering the machine off. I have scanned for virus (AVG, Charter, Windows Defender) and malware (MalWareBytes) with no results. I have replaced the ram (from 4G to 8G). Chkdsk finds no bad sectors. Using a vacuum, cleaned out the vents (there was some dust, but not a great deal). Tried repair windows, it finds no problems. Tried selective startup, only loading Windows files...still locked up. There appears to be no rhyme or reason to it. Machine had no trouble with extensive scans that took hours to complete, yet sometimes locks up as soon as you go into Windows. I am at a loss so ANY help would be appreciated.
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