I was using my computer one day and all of a sudden the screen went blank, and it won’t turn back on. I have unplugged everything and plugged it back in, still doesn’t work.
Only thing I can suggest is to leave it switched off for a long time with everything unplugged completely, sometimes this can help. Otherwise take it to a local computer shop.
There isn’t a lot you can do to a system that has completely gone off.
You could either try replacing the power supply if you are more confident with pc hardware or I would just take it to a local store to have a look at for you.