Weird one this, and - if it's been posted elsewhere, apologies - i can't find a similar thread. This is a stock 1050 in immaculate condition.   Ok - important (i think): This symptom manifests itself regardless of whether the 1050 is 1] connected to Atari XL 2] booted with or without option 3] powered-up unconnected to Atari XL NB - when connected there is no "boot error"   now the dumb-ass description of the symptoms   power-up drive spins for 2 seconds...stops for 2 seconds...driv