2005 Volvo 630. No HIGH RANGE!!

I have a 2005 Volvo 630 with a D-12 and a Meritor 10 Speed with the electronic HI/LOW Range selector. I am not getting any High range out of it. Had it when I drove it home, sat for a week, and now WHAM, no HI range. Any help would be greatly appreciated!

 

Thank you Duramaxxed for your quick response, sorry I didn't get back to you. Ended up finding the problem on my own, when I had new batteries installed they put an independent ground cable on the positive terminal instead of negative. Changed this and the Gearbox Ignition 15 amp fuse and it was working fine again. Naturally this was after 6 hours of tracing wires and checking ends, etc. Thanks again for the offer of help though!!