After a few hours of inactivity , my screen goes white with a flashing file folder in the centre with a question mark in the centre of said folder. at this point i can only unplug the computer for it to reboot properly, then it is fine till the next go..

After a few hours of inactivity, I return to find a white screen with a file folder in the center of the screen with a ? mark in the centre of said folder and both are flashing...am i compromised?

No 
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