POST issue on Shuttle G5 models - check setting of jumper JP4.

  1. Most of the time when your system won't post it is because the J4 jumper pins are loose and losing connection to the motherboard. This means, when you turn on your computer it won't show anything on the screen, known as the No-Post issue.
  2. To fix this, please unplug the power cord first, then open the case and remove jumper J4 from the motherboard and put it back in place upside down.
  3. Now please restart the computer and the BIOS screen should appear.