serious display errors

Hey everyone, i dont know if anyone else has experienced this or not but, i am having trouble getting my numbers ( i.e. altitude, headings, vertical speed, engines, ect) to show up on my MCP panel, the HUD panel and the MFD's. I have uninstalled both the PMDG and FSX and reinstalled both. Everything worked fine at the time of purchase but i cant figure out what went wrong along the way! Ive read the instructions on how to start up cold and dark and followed everything as i was told but i cant get my numbers to appear. my display settings are fine. the FMC works fine, i can see everything on that too. any suggestions? plz help. and thx in advance!