Hi Mike, welcome to the group. I am one of the "Commodore guys". Congratulations on your entry into the wonderful world of Commodore! Look out for Evan's trash talk, he is an Apple guy. ;-) Your diagnostics sound good so far, but hard to go further via e-mail. Where do you live, are you near the museum? I am in PA but might be able to meet you there and work on it with you sometime. Let me know what you think. Chris On Sep 18, 2018, at 1:25 PM, Michael Pohl via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote: Hi- I'm new to the group after meeting Evan at Infoage recently. My 12 year old son is a vintage computer/vintage video game fan. We picked up a non-working Commodore 64 as our first project. We watched a few YouTube videos and ran the suggested basic diagnostics and found that the power supply produces the correct voltages, the fuse is good, and there is the correct voltage at several key locations on the board. Connecting the RF modulator to a TV doesn't change the picture (still only snow) and connecting via the 8 pin jack to a Commodore monitor produces nothing. The computer is an cosmetically good shape and does not appear to have ever been opened up as the RF shield was intact. I note that only three of the large chips are on sockets. Any suggestions for next steps? Thx, Mike