Many years ago I purchased a replacement power sup...

Many years ago I purchased a replacement power supply for my P.C from SWS. I was given excellent advice on how to perform this task. Recently I purchased a printer and could not get it to work. I called up the store for advice. They offered to do the installment for me for $40 if I brought the computer and printer in their store. No one, including the directions, suggested that I reboot the computer. Luckily I overcame my stupidity before giving this store more business. This store may still have good deals. The expert advice that I once swore by seems to be missing.