Philips Home theatre system HTS3000

Question

Hi
I have a problem with my Philips Home theatre system HTS3000.
Whenever I put any CD or DVD the system shows "No Disc"
Once in a while it starts playing the CD which ever it is.

I first thought its a CD problem. I started trying with my other DVD -Pioneer.
All CDs are perfect in quality.
Please help me out in solving the problem.
Thank you
Muthu Sakthivel
[e-mail]