I recently had a problem with my computer where I was getting crazy lines on my monitor. I changed monitors and it didn't help, so I knew it had to be the computer. I know nothing about computers, so I asked a co-worker what to do, and they recommended Castle Computers. I brought the computer in there and they found out it was the video card and changed it in no time. The computer worked great after that. Their fees were reasonable and they were very courteous.