Wow, that's quite a conquest! Congrats!
The LaserActive with the Genesis/SegaCD units I've seen on eBay tend to go for quite a pretty penny and it is interesting seeing just how many non-Sega devices had a Genesis crammed into them.
I had forgotten that Compaq kept making their crazy Presario All-in-ones after the 386/486 versions. Doubly weird that from the front it looks like an actual all-in-one but from the back it's clear that they literally just took a desktop, glued a CRT to it, and called it a day. You even have to plug in the "built in" monitor with a VGA cable no less! Given the build date of July '96 I'm guessing it's a Pentium 166 at best. Still, a cool machine nonetheless. If you still haven't been able to get into the BIOS something I had luck with on my Presario 4840 was to "force" it to give me the option of entering the BIOS by just holding down a bunch of keys on the keyboard at power on so it threw a keyboard error and gave me the prompt to enter the BIOS or continue booting.