The system came with 2 Gigs of ram (1Gig x 2). I'm just trying to add 2 more (1 Gig x 2) for a total of 4 (1 Gig x 4). In case the installation was the culprit, I reloaded Windows 10 Pro last night. No go. Same result. My first 2 modules (without the 2 I just bought) allow the system to work normally (albeit, a little slowly because I'm running the 64-bit version of Windows 10). If I take out the original 2 megs and put in just the 2 new modules I just bought, the system works, as well. But all four installed gives me: "ACPI BIOS ERROR."
I haven't been able to find any new bios versions online (Currently: Phoenix, LTD 3.06, 1/25/2006), and HP discontinued support for the m7306n. The 2 new memory modules are identical to the original two. PC2 - 4200 533Mhz. Even if I did find a bios update, it would most likely be for Windows XP. I'm not sure how I could get that to work while running Windows 10 Pro.
The computer has no other problems at all, and it's been my go-to computer for about 4 years. While three new HP laptops have come and gone, this system keep on trucking. All it needs is the additional memory.
Thanks for the brain power and your time.