Hello,

When i tern on desktop COMPUTER the CPU works it self but the Monitor, keyboard and mouse is not working at the start up. Does anyone know what I can do to fix it.

It's a Windows Vista HP Pavilion Slimline s3000.What may have happened prior to this ? ?What do you mean?

I started the computer up and the computer wouldn't respond to the Monitor, Keyboard (Lights didn't flash) and mouseIf the display isn't working, how do you know the mouse and keyboard aren't working?The mouse at the bottom is not showing red, because it does that what it starts up, My keyboard the 3 blue lights showing Caps lock, Num Lock and Scroll lock dont flash and that normaly flashes when its starts up.Remove all power to the machine and reseat all connections...

If this produces no joy-joy then borrow a PSU of the same or greater wattage and swap it in there...NOPE i have not Joy-Joy i'll have to get a  PSU. What is it and where is it in the Computer?Usually mounted at the top rear of the case on a Desktop...
As i said THOUGH ...borrow one instead of buying...in case it's not the culprit.yeah ok will do thanks for your help, do you have an image of what i need to be looking for.Clik Here...ok ill borrow one of them and see what happens from there. Thankyou for your help.