You can try to remove the video card and see if it boots to the onboard graphics that is there as mentioned by Wither and may be a good idea.
To make life easier for situations such as this, it might be worth spending $20-30 for an internal CD\DVD drive. I know it won't be blu-ray or maybe won't have all the bells and whistles.
After reading further, I see you have a notebook and don't appear to be comfortable getting inside it. When I saw you have a 7600 GS, I naturally assumed you have a PC because the 7600 GS is a video card and I wouldn't expect it to be installed in a notebook.