Chance it's not fully completing loading. Check the coupling hidden inside the plastic worm gear of the loading motor, it often splits in K-mechanism. Usually results in F03 or F04 fault indication on front display.
Otherwise, suspect capstan drive IC or capstan motor itself, if no capstan rotation whatsoever. Normally tape would be ejected immediately without capstan. If it is a capstan fault, probably not worth repairing.
Cobweb, June 2005