ok then, if that particular DVD boots in other systems, and your laptop does boot other bootable CDS/DVDs, then I can only assume 2 things to be the reason:
Your DVD disc's format/brand is not supported by your laptop's DVD drive. (Yes, some drives don't like certain DVD disc brands, you might want to consider copying to a different brand or format (DVD+R / DVD-R)
Your laptop's hardware has a problem with the Windows 7 64bit DVD.
However, it should at least start and give you an error later saying that "you're trying to run an 64bit system on a 32bit machine". Since you're not getting this error but you just can't even see a boot/startup screen, it's probably case 1
I suggest you try and install from a USB stick and see what happens.
How do you make a USB drive bootable so I can load W7 on a netbook?