I agree with OldTurkey on bad caps. We used to buy complete repair kits with all the caps but those aren't available any more.
I had a 1984 128k M0001 machine sent to me last month, first with bad RAM and after that the caps failed after 5 hours. As I'm not up on this machine anymore I sent the power supply board to this guy and he did a great job on the repair with high quality parts, he is slow but does very good work, and his prices are very reasonable:
22222 ROETHEL DRIVE
NOVI, MICHIGAN 48375
248 325 8812