So I have a T3500, was running normally, unplugged a RepRap 3d printer that I had just finished building, about 5 seconds later the computer died, on re-starting it flashes the Pb7 error code, which translates to:

according to the service manual.

I've tried powercycling, resetting the BIOS, swapping around RAM sticks, adding/removing PCIe cards, nothing helps. Has anyone else had this issue and been able to fix it/could suggest possible fixes? The workstation was acquired second hand so it's out of warranty and we really can't afford to replace things.

Thanks in advance for any help,

// RG