PMDG 747-400 Radio Panel Problems

Hello all,I am having some problems with the PMDG 747-400 at the moment. One thing that i have noticed is that the radio panel looks "dead", literally, none of the displays show so its hard to enter the squawk code and radio frequencies.Another problem that sometimes occurs is when i am flying and suddenly the screen flickers with fs2004 and pmdg 747 normally cruising and it starts acting really strange (barrel rolling) really slowly and then the graphics going really awful like in safe mode.Really want to try and fix these problems if possible. Ive spoken to Mesh Computers and they seem to think it might be a hardware failure on the graphics card. Im reluctant to send it back as i will lose it for 4 weeks (really hard when you love the plane)Its a fantastic plane that you have produced and its a pleasure to flyThanks in advanceBen