Laptop boot problem

Hello Everyone. I have a problem with my Toshiba laptop, and wonder if anyone here has any ideas as to its solution. I have tried to Google it but get nothing.

For the most part the laptop will boot into Windows 7 with no problems, but, there are times when instead of going into Windows, the screen is blank (black) and remains that way. I have noticed at these times, always the DVD drive light is on as though it wants to boot from there. I cannot shut down the laptop with the power button, and have to remove the battery each time to turn it off. Then replace the battery and turn it on, and it is again 50/50 whether it will again try to boot from the DVD, or go into Windows. I have reinstalled Windows and the problem remains. Any suggestions will be much appreciated. Many thanks in advance. Andy
 
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