HP54825A Infinium scope

Found this with a quick search, don't know if it addresses your issue, but it seems promising:

It's an interesting article, but it does NOT address how to set the BIOS up to see the hard drive.

But thanks for looking.

Buried in the service manual is the BIOS set up. IT recognized that there is indeed an IDE drive present. Then complained it couldn't boot from it. For a week or so, I thought there was still something wrong with the bios.

Surprise, coincidentally with my wiping the BIOS, the hard drive decided to quit working. Replacing it with a spare that I already had as an image the scope booted right up.'

Holmes was right. "What ever is left, however improbable, is the answer."

The motherboard in the 54825 died, so I bought a 54845A as a replacement. I'd forgotten what a cluster f*ck it was dealing with Windows

1. After a bit of the usual flailing around, I upgraded to Windows 98 Second Edition and upgraded the USB drivers, nice, I can mount an external USB hard drive now. I also installed the drivers for an HP LaserJet 1200 printer so I can click the print button on the screen. Next trick is to use this: to mount the 8 Gig SSD in a Dell PC chassis so I can load Windows XP on it, then do the HP Infiniium XP upgrade. Yes, I'm having too much fun with this.

Here's a fun YouTube video of a guy working on a 54835A on the workbench. His has Windows 95 as the operating system.

I'd also forgotten, intentionally. No thanks for reminding me of past nightmares and for raising the dead.

When your HP Laserjunk 1200 decides to feed multiple pages ending in a paper jam, there are kits that claim to solve the problem.

I've had a bit too much entertainment dealing with Windoze XP and SSD drives. XP does not have a built in TRIM function. Without TRIM, the SSD does too much writing and can limit the life of the drive. I didn't have much luck with various workarounds. I assume that HP did something in the Infiniium scope series to stretch the life of the SSD, which might not be present if you replace the OS: Opinions seem to vary as to using XP on the scope:

Nice scope. Good luck.