|Do you often buy things from Ebay for $14? If so, there is a good chance it is power supply, as cheaping out on this can be very bad. |
Definitely try another power cord/battery and see what it does then.
Having bad RAM/CPU would cause the hard drive not to start, as BIOS wouldn't be able to load, and BIOS is what causes the hard drive to start. But no, a bad graphics card would not cause for BIOS not to load.