Computer keeps freezing


Feb 9, 2012
hello i have got a prob with my comp which im even nt getting ...
whenever i switch on my pc it works fine for 1 hrs or less n then it freezes keyboard stops working but mouse is working.. i even replaced my keyboard but still it persist n even when i shut it down my cpu blue light keeps blinking on so i hav to turn off the ups to switch off the system n after that it never turns on for 6 to 7 hours means cpu turns on but no screen .. i did evrything.. cleaned all the internal stuff but with no luck... plzz help..