Something a bit out of the ordinary for here, but this forum has been a great resource for me so far, and at the end of the day I am still trying to run obscure software on old hardware.

I have the pleasure of diagnosing and repairing an obsolete ESAB Vision CNC controller. Inside, everything is branded ATAS, a subsidiary of ESAB, but in reality it's a Pine Technology PT-319A in a fancy enclosure. A such, I have another supposedly tested PT-319A on the way as a spare for this machine.

This unit was functional, but after sitting for ~6 months awaiting setup in a new shop, it is no longer. It has previously been configured to boot the specific ESAB software from a USB drive in a floppy emulator, doing away with the original drive.

I have verified the power supply is functional on all pins. The CMOS battery was dead and had corroded the traces underneath it as expected. I have removed the original battery and cleaned all corrosion. One trace was broken and this has since been repaired. I am currently using an external 6V CMOS battery. All other traces look good visually, and I have tested continuity one every 5V, 12V, and ground trace I can find.

When powered on, I get a flash on the LCD screen and the backlight turns on which seems to imply that the screen itself is functional. I am assuming some BIOS settings will need to be changed to once again boot from the thumb drive, and the integrated display/button interface will be no help in this regard since it won't display the BIOS and I do not have a proper keyboard, only machine-specific buttons.

This is the result when powered on with only RAM and POST card present on the motherboard: https://youtube.com/shorts/QHOec8Ea27Y?si=AsFadSGER--_ylYz

The POST codes don't seem to indicate anything abnormal to me, but I am having trouble assessing the beep code heard. I hear 2 slow and 2 fast beeps. 2 beeps seems to point to a RAM error, but I'm not sure that's what the code is in this case. Does anyone have any insight? Swapping the location of RAM or only installing 2/4 sticks doesn't seem to affect this beep.

As it stands, I think my next steps are to connect a normal monitor and keyboard to attempt to access the BIOS to make sure it can see the thumb drive and boot from said drive. Is there another course of action I should take instead?