I have spent a couple of days on this including re-installs but my 757 refuses to pick up either the ILS LOC or GP.  I have tried manual and auto-tune and in both cases, the correct freq and hdg are displayed but even when I am right in the middle of the beam I see no indications that the on eitherADI or HSI - for example, neither the localizer pointer and deviation scale or GP pointer and scale appear on the ADI.

V odd and frustrating so grateful for any help.