Great to hear you were able to install the Mackie OS to your CF cards, and can boot the D8B again, awesome!
As for the CLEAR CMOS jumper - this is what that is and how it works:
The CLEAR CMOS jumper has 3 pins. This means that a jumper can be put over the first two pins, or over the 2nd and 3rd pin.
When the jumper is in it's default/original position, it does nothing. Removing the jumper, or having it in the original position is the same thing. The pins are not connected and no contact is made. Basically, the "disconnected" jumper position only exists, to have somewhere to "park" that jumper when it's inactive.
The way to use that jumper, is to place it over the other pair of pins, and then turn the D8B on - but only for a moment.
The D8B will NOT be able to start up with the jumper in the "CMOS CLEAR = ON" position. You only turn the D8B on form a moment, to supply power to the mainboard... but once you do this, ALL the BIOS settings are reset to their default factory values.
After you turn the D8B off and remove the jumper again (or move it back over the 2 pins it was originally on), the BIOS settings will be WRONG for the D8B. You will have to go into the BIOS and re-do the settings.
...and if you EVER had that jumper on the "ON" position, your BIOS settings WILL be wrong. This could be the cause of the lock-up (...but it's still possible that it will turn out to be a hardware problem. But let's double-check the BIOS, first).
I know you said before that you double-checked the BIOS settings... but considering how important it is to have those set correctly, please spend a few minutes on each of the BIOS pages to compare each setting REAAAAAAAAAALLY carefully. A single deviating setting in the BIOS, might already be the reason why the D8B locks up.
There's two different kinds of mainboards that were installed from the factory in the D8B. The "old" type and the "newer" type. Please look here, to figure out which mainboard you have:
https://www.sonido-7.com/d8b/maintenance.html#Post14Depending on the mainboard you have, please use either of the following links to check your BIOS settings:
Old Mainboard:
https://www.sonido-7.com/d8b/files/d8b_old_mb_bios.pdfNewer Mainboard:
https://www.sonido-7.com/d8b/files/hdr_ ... b_bios.pdfIf there's anything that doesn't look right, or if you can't find a setting, please mention it here, so we can sort that out. I just want to make sure that we don't continue troubleshooting and you start spending money on hardware that might have gone bad, if it would just be a wrong setting in the BIOS, somehow. So, be REALLY careful when you double-check these settings and change them to what it should be.
Let's see if the D8B still locks up after that. If so, I'd need to know exactly how this happens... but let's try first if the BIOS settings might have anything to do with the lock-up, again.
Best of luck, Pino!