Lenovo G450 - DVD-ROM problem

Hi!
I got a lenoo G450 laptop wth a Windows 7 OS installed on it. The problem is that sometimes my DVD-ROM is not detected even i reboot the system.
What's suppose to be the problem here?
Please help
Thanks
Jessie Boy

Uttam Welcome to the forums
Take it to the service center,its the best option for you.If i am not mistaken there is an authorized Lenovo service center in the CTC complex near Secunderabad.... 
PS : Please donot send in PM's regarding help,instead  post your queries in the forums 
Cheers and regards,
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I am a volunteer here. I don't work for Lenovo

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