future computer problem???

i go on my computer evry day for sometimes a few minutes and sometimes hours playng games but yesterday when i was going to turn it on to do some research it wouldnt turn on so i unpluged everything put it back in then put the power cord in a different place and then i tried again and it turned on but then the next day the same thing happened what could be the prob the comp is working now but maybe in the future something will happen?????

You might have a couple wires on the inside loose. Open up your case, release your static charge on your case or PSU(Power Supply Unit) and check that all the connections are tight.

If you're computer is old, your PSU might just be crapping out

So I'm guessing you put in a new graphics card and PSU then right?

What did you put in? Maybe your new PSU can't dish out enough power for everything, especailly if you got a graphics card like an 8800GTX