Desk top computer shuts down only to turn on and get invalid disk message

Gumibears9014

Honorable
Oct 23, 2013
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0
10,510
Hello, I am not as computer savvy as most. This is my problem I hope someone can help me out in 'English' :)

2 weeks ago my desktop shut down/turned off by self. Wouldn't turn on, I went in to the diagnostics and ran the basic tests and everything came back checked and good. I was ready to take it into my computer guy ( 2 days later) when I decided to try it one last time, it turned on and was great. I was able to back up everything I needed to.....

2 weeks later, same issue just turned off. This time when I turned it back on it said 'invalid system disk'. I called my computer guy he says sounds like hard drive is out. I went in again and ran more test just for my hard drive, everything came back ok. Computer still gets this message....

My question... This last time when I was in one of my menus I clicked on hard drive and hit enter and all of a sudden my computer started and loaded my windows and seems to work. What did I do? What could be my computers problem? Should I take into computer guy or is this something that I can fix?

I am not as savvy as most but with good direction I can do most anything. Thank you