|I have a computer in the garage that follows the following rules.|
When on, it creates heat. (a lot of heat)
When parts heat up, they expand.
If run 24/7 for a week and turned off for a day it will not start.
Because as it cools the parts contract.
When fully contracted they loose their connection.
I admit it's an old clunker, but you may want to open the case, after unplugging it and check...wiggle all the connections.
Just a thought.