how do I repair my computer desktop

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I have heard some tutorials on youtube on how to repair a non working desktop. My computer desktop has the fan running when i turn it on but i don't see anything on my monitor. There's a light on the power button. But besides that it doesn't do anything more. It wont open. Although the hard disk drive open and close if i push the button. I tried to see all the possible problem as i have read or seen online and nothing seems to solve my problem with my desktop. I don't want to pay for the repair service because it is quite expensive. Actually i have it actually repaired it last year but after few days it wont open again for unknown reason so i have given up going the repair service. I didn't want to keep paying anymore and having the same issue again after few days. If i keep paying on the repairman and it's like buying a new desktop already. Yes it's better to buy a new desktop since computer now is not that expensive and also they have better specs. Mine is quite old it was built about 2009 and i was able to use it for about 3 months only. So if you have any idea on how to get it going or running i like to learn.