@Hammer
The machine hung after device check when that harddrive was attached (so BIOS was accessible but a lockup occures if you didn't go to BIOS set-up).
The BIOS had to be updated by removing the harddrive, installing a floppydrive, booting from a disk and flashing the BIOS.
After this it was okay to attach the harddrive again and we got pass the device check.
I wouldn't call this bootable.