Hi folks, any help here would be greatly appreciated. I have a desktop PC built by a guy in a garage about 5 years ago. It runs Windows XP. Three nights ago I shut the PC down. No signs of trouble at that point. The next morning I went to power it up. I pressed the button and absolutely nothing happened. I suspected a bad power supply so I purchased one locally and installed it myself. I have a minimum of technical knowledge or experience but have replaced several hardware items in the past, including a disc drive, hard drive, RAM cards, etc. After installing the power supply, I booted up the PC. No beeps. The fans run, the tower lights up and all seems normal, but 2 problems have arisen; #1, No video. The monitor acts like it is not receiving any signal from the PC. #2. The USB ports will not power the optical mouse.
Oddly enough, the USB ports do have power; I hooked up my cell-phone charger to the ports and in each case, the phone indicates "charging" on the display screen. But it won't light up the optical mouse. Despite a relatively uneventful installation process, these events have me thinking I have done something wrong. Any thoughts ? Despite having installed some hardware, I'm pretty tech-ignorant, so if you would be so kind, please try to avoid jargon and dumb down your answer as much as possible. (example; "plug the red thing into the blue space") Thanks in advance !