MaxwellRetros

Hello guys, I am hoping someone can help or advise. I recently bought an Atari 520 STFM and when plugging it in the disk drive makes an awful sound and I get a red screen. I opened the disk drive and saw that the belt had broke. I think that it would probably be an easy repair but the issue I have is the red screen? Would the red screen be because of the broken disk drive, or is that a separate issue altogether? Thanks Mark