DVD-RW drive not accessable

Hello, Expert,

My PC (Acer Aspire M3630 with Vista OS) got problem: DVD-RW drive is not accessable, when I insert a DVD/CD into the drive, the light flashing very long time, then, when I explore the drive, it will eject automatically & "Please insert a disc into drive 'E' will appeared. I can not burn the DVD /CD also. I have checked device manager, the DVD drive & name can be found & "this drive is working properly" can be seen also.

Any expert got solution?

Thanks & Best Regards,

Ding Fu