Before you move on to other things- I would check those capacitors again. Including the new ones. Remember we had a bad batch of capacitors a few yrs back, those could be out of that batch? you can look it up online- I can't right now otherwise I would for you. You say you believe its the power supply, but then mention the light comes on!
Just my two cents... as I went through a similar repair myself, and it was all due to capacitors... you can't tell with these by looking if they are bad...