I have a Digital Research 12x DVD-ROM. I took this unit from my old system (where it worked fine) and put into my new system Asus P4C800-E,P4 3.0,1gig Cosair pc3700 & ATI 9800XT w/Win XP Pro. After booting up DVD player keeps ejecting with or without disk. Player uses windows drivers. can someone help me solve this problem.