If you're setting it to boot from the Internal CD/DVD Drive and you're getting, "no bootable device," it isn't recognizing that Windows disc.
Home-made discs have to be burnt at a very low speed and created as a bootable disc (usually a checkbox in the burning program), otherwise they may not be recognized. Retail discs should have no trouble being recognized. What kind of disc do you have?
1. Try turning the computer on.
2. Put the disc in and press and hold the power button until the computer powers off.
3. Then power back on and immediately begin tapping F9 repeatedly.
4. Then from that menu choose Internal CD/DVD Drive.
If you still get the error, it's not recognizing the disc. If you can still see the Product Key for Windows on the bottom of your computer, you can get the Windows 7 ISO from here and burn it with ImgBurn. Burn at the lowest speed possible, 2x or 4x.
Let me know if you have any questions on that :)