Possible bad capacitor?

[Stoneradio83]

I’m new to this forum and hoping you all can help me out, I have a desktop I’m using for college and it has been giving me problems for the past few weeks. I have completely whipped the computer, but from the symptoms it’s having which include spontaneous reboots, not always turning on, and frequently having to be reset I have been told I may have a bad capacitor on my motherboard. I don’t really have the cash to be getting a new one or sending it out for repair, how can I tell which is the culprit if I cannot do so visually so I can replace it? Thanks for any responses.