I just posted this in the other thread . . .
A word of caution with switching power supplies in DKs. . . I've got one in mine. It worked like a charm with the 4-board set I had in there (this is an early dk that originally came with a 4-board set). I bought a DJ Jr. 2-board set and that worked like a charm in there too. Then I bought a 2-board set from Anthony at quatercade (he is the only one I could find that would guarantee me a boardset that met twin galaxies' stupidly insane standards). Anyway, the first board Anthony sent did not work right in my DK. It was playable but it had lots of what I'll call, vertical sprite glitches. I told Anthony about the glitches and he said, "hm that's weird, I'm sure I tested it, but send it back." I sent it back, he tested it, and says its working fine on his end. At that point he asked about my power supply. I told him I had a switching supply currently installed. He said that he's seen compatibility issues with DK boards and switching supplies before. So, Anthony being the stand up guy he is, goes and tests a bunch of his boards using a switching supply rather than a nintendo supply, and he finds out of 3 boards he testedo 2 had issues with the switching supply. He sent me the one that worked with the switching supply. It works great with my switching power supply.
Then I try to install a DK2 kit on the board from quatercade. DK2 plays fine on it, but when I try to play DK through the kit, the game has some weird glitchy stuff going on making DK unplayble with the kit. I send my board and kit to Steve at Acade Shop for him to check it out. He replaces the z80 socket (for FREE), tests it, and says everything is working fine for him. He sends it back to me but it still does not working right in my machine. Steve also mentioned something about the power supply being a possible problem but was not sure.
Anyway, my next step is to install an original power supply and see if that changes anything. I'm not by any means saying I'm sure its the power supply causing the issues, but with Anthony's experience with the switching supplies causing problems on DKs I'm suspicious that my problem might be my power supply.
I need an original power supply to submit scores anyway.