There are several common problems which you may encounter.
System does nothing at all after switching on:
Check mains lead correctly wired
Check that the fuse is not blown
Check mains lead continuity
Check +5V and ±12V voltages from PSU
If the PSU is receiving 240VAC input but not giving the correct output, then the PSU is faulty and should be returned to Arcom.
Power is reaching the STEbus but nothing appears on the screen.
Check the monitor mains lead and fuse. Adjust the brilliance and contrast.
System fails to boot up properly or locks up
Check boot disk not corrupted (try using it to boot another PC).
Check keyboard connections (must be a PC-compatible keyboard. If you have previously attempted to boot from a non system disk, and the BIOS retries booting from a correct system disk, this may not work because the wrong boot track has been read.
Use CTRL ALT DEL to reboot from the correct boot track.
Both Disk drive LEDs come on.
Disk cable reversed.
Screen display erratic, off-centre or distorted.
Check the display matches the correct sync. frequency for that display mode, as shown in the SPEGA manual.
Check default display-mode link LK1.
Check the monitor ground lead.
Screen display breaks up when application program is run.
Check that the display mode required by the application program matches the way the SPEGA links are set.
All Arcom boards are tested before despatch, hence simple mistakes in setting up are the most likely cause of problems. However, if none of the simple faults described above can be diagnosed, contact your supplier for assistance or details of how to return the suspect board.