An update from the original post: The emulator works with both my HDMI monitors, both directly via HDMI and via a VGA or DVI adapter. MAME works OK. It doesn't work with the old Dell monitor despite trying the video modes in recalbox.conf which are supported with the tvservice command. I've tried other video configurations in config.txt too. I ran into problems with dual xin-mo joysticks on MAME with Recalbox so I've decided to stick to Raspicade for the arcade machine and use Recalbox with a spare monitor for N64 games.

I've got Recalbox running nicely with N64 games on my main computer monitor, but when I use an old Dell monitor (via a HDMI to DVI or a HDMI to VGA cable as it doesn't have an HDMI input) N64 games don't run. I get the Recalbox logo then a few seconds later it returns to the N64 Emulationstation menu. I've tried setting the video modes are suggested here: https://github.com/recalbox/recalbox-os/wiki/N64-%3A-return-to-ES-(EN) I've also tried the different video plugins rice and n64 (selected via Emulationstation). Any suggestions on what to try next, or where to check for error logs? All I change between it running and not running is the monitor and monitor cable. I really would like to get it going with this old Dell monitor as it's part of an arcade machine I've made - so not easy to change for another type.