Can't help you with the beep codes, but I can tell you the board is an 865PE Neo2-P Platinum Edition.

https://www.msi.com/Motherboard/support/865PE … latinum_Edition

https://www.acs.edu.au/info/computers/compute … beep-codes.aspx

Search "ami bios beep codes" and you will see many pages that will help you

I take it 2 shorts, a pause, and 1 short counts as separate reports then?

I don't know, as I never had errors on a computer with a case speaker. I use a POST card to get error codes. Sorry.

I just checked a few sites, and can't find a description for that combination

Well, I've ruled out the CPU being an issue unless the extra P4 I grabbed happened to just go bad as soon as I moved it (it didn't). Assuming the longer pauses denote different reports, my next guess would be to try memory but I doubt every single stick I've thrown in there has also somehow gone bad (2 modules were in there already but I tried another 2, one at a time, from a known working, all are DDR-333); either way I think I can scrounge up some more.

Failing all that, guess I'll see if I can't get me one of those POST cards and see if it'll give me anything more specific.

EDIT: although, honestly at this point I suspect maybe the old board just up and fried/borked the known working ones when I had tried them over there

To me, it sounds like it boots, then complains about CMOS settings being reset to default (dead battery). I've had this sound combo happen on one of my P4 AMI boards.

If you don't see anything on the screen, try a known good video card and monitor. Also try clearing the CMOS.

computerguy08 wrote on 2020-11-18, 13:09:

If you don't see anything on the screen, try a known good video card and monitor. Also try clearing the CMOS.

new battery and setting the jumper to clear CMOS didn't change anything. Forgot to grab the only other AGP I've got from work (which I know works) so I guess it's tomorrow's problem >:/

Although, I've noticed every time I flick the PSU back on it seems to pulse power through the board for a bit before calming down.. on the old board flicking the PSU on would just turn the machine on and it would ignore the case button presses; think it might be going out? It's an Antec SL400 that came with the system forever ago (early 2000s) when my dad got it

Boards have different behavior when they come in contact with the 5V standby signal, some power on for a brief second, some don't at all.

Alright, I'm not sure exactly what I did but yeah those beeps were some incorrect bios setting; I guess the monitor I was originally using was fried out because even with a known working GPU I pulled from work it still wouldn't show a picture.. Swapped it out and bingo we have lift off

Well, I'll be holding on to the bit of DDR I ordered as spares, just in case. Really just glad to find out the 5900XT my dad left in there is also still very functional, means I can stop watching a number of ebay listings haha. Either way, I'm off to beat Windows 98SE onto the thing and pray nothing else goes awry so thanks for y'all's help