I have a user running Windows 7 Pro on a Dell Latitude E5400. He was complaining about his computer crashing five times a day, so I checked his memory/hard drive for error and came up with no faults, then determined that his RAM was insufficient for the amount of programs he was running, so I upgraded from 2GB to 4 (3.45 usable)....Upon giving it back to him, about an hour later (while only using Word and Outlook), he reported a freeze. No mouse/keyboard input available, no blue screen, just a total lock up of the system.
I'm guessing there is a loose connection somewhere, but I'm not sure. The computer doesn't seem to be overheating either. Malwarebytes scan came back clean and the system has been protected by Kaspersky all along.
I'm not sure what else to check. Does anyone have any recommendations? Thanks!