I have a Dell Dimension 4550. I don't know much; please bear with me.
A friend gave me additional RAM to install, but it turned out not to be compatible; the computer wouldn't boot with it. So I removed it.
Now the computer still will not boot. It starts to the extent of checking the CD drives, and there is a green light on the motherboard that illuminates - but that's it. System doesn't seem to recognize keyboard or mouse, monitor goes into Power Save mode. ABCD lights in the back are dead.
I have checked all connections, nothing seems to be amiss. Did I short something when I tried to install the incompatible memory? What else could it be?
Thanks for your time.