AEG OKO Favorit 50750 vi powers on but no programme lights?

My 8-year old (inherited with house) dishwasher has been increasingly grumpy, at least every other wash has to be re-done as dried remains can stick on plates, some cups come out with coffee inside etc. I do rinse most things before putting in and have replaced certain parts to do with filtering/draining etc. Then this morning the 'on/off' light comes on but no lights come on for the programmes. The last wash was same as usual - ok-ish - but I didn't notice whether the 'end' light came on or whether it stopped mid-cycle. Desperate not to replace as money is tight - it there anything I can check and replace myself does anyone know? Thanks!