My computer hangs when I insert DVD in Matshita UJ 8455

[qanda]This question is published in the hardware section for the Matshita UJ-850S. Click here to view full specs.[/qanda]Iam using my laptop Toshiba Qosmio G20 since 2006 February, which is equipped with UJ-8455, From last one week, when I insert CD or DVD my laptop hangs. Please help me. I tried all firmwares, nothing worked.