aristotle341

Hi - I'm new to the forum. I live in England. I have had my Atari 800 since 1981 and its worked flawlessly. Until now. It is recently developed a problem - there is a system crash a few seconds after boot. This happens whether there is a cartridge in left slot (e.g. BASIC, game) or none (i.e. Memo Pad). In Memo mode, the screen initializes and then - accompanied by the keyboard beep - characters appears on the screen before it crashes. I believe the keyboard beep is significant - does it point to a problem with the keyboard? If so, how do I diagnose and fix? I appreciate any help or pointers to other resources. Thank you.