After retuning from a few weeks away, I tried to turn on my computer and not lights, no fan, no nothing.  I tried changing power cords, plugs and still nothing.  It was working fine when I left.  I TURNED it off before leaving.  Any ideas?  Are you sure everything is plugged in?

Just to make sure, does anything else work in that power socket?Yes, I have checked the power source.  I am at a loss as to what to try next.  I have switched power cords, outlets, turned on and off the switch on the back of the tower.  Any other ideas?I cannot be sure but I think something may be wrong with your PSU (Power Supply Unit).
Is it POSSIBLE you can try another PSU?Help, how would I do that?This is a PSU:


It can get a BIT complication so I would suggest an experienced user do this for you.Thanks.  I just FINISHED reading online how to replace the PSU.  It does not look too complicated.  I have done a bit of repair.  As long as there are not too many supply plugs, I should be okay.  Any SUGGESTIONS on what brand or type I should buy?  It is an older computer, but has had many upgrades over the years.  I am running Windows XP, not sure of the processor speed, but it is about 3 years old since upgrades.I wouldn't ask me what PSU to get. I don't really have an preferences.
Something that cools well would be preferable. Thanks again.  You have been a great help.  I am sure I will find an appropriate one for my system.Good Luckif im not too late, i recommend a corsair PSU. they are known to be very reliable and they also come with a limited 5 year warranty.