Thanks dominique
Expat.. There is a specific sequence to follow.. I'll give you a brief list:
1-Batteries on (both)(and the bus switches (all of them))
2-Standby power on
3-Fire up both inertial guidance systems (align position)
4-fire up the APU (make sure the APU generator is engaged)
5-Engage external power (brings the APU online)
6-Turn the avionics on
AFTER the inertial guidance align lights go off.. switch them both to 'Nav'
NOW... at he FMC panel.. set your initial position. If you have not touched it yet , it's easy.. you can see the bottom/right button saying something like "Pos Init".. click it. Now, you'll have several references to use. The only one that seems to work, is the top one. Click the top/right button and wait a few seconds. If the HSI and Attitude Indicator don't come to life.. then click one of the other refernces on the FMC, and quickly re-click the top one. It seems to be the one that works. Remember, if you're not tuned to a nav-aid, you'll still get the red 'X' on the HSI, but it will no longer say, "HDG FAILED". Sometimes, it takes extra time for the Attitude Indicator to kick in.
Now you have a working HSI and Attitude Indicator, and could fly around without the FMC..
Let me know when you get this far.