If you really followed the power drain procedure to the letter, I can't see anything else because the fan is running, you are not getting any hardware, HD error messages. It looks to me as if it's booting. Even a virus would not give you a blackscreen.
You may try one last power drain procedure:
1. Remove the RAM sticks (Clean with a soft lint free cloth while they are out)
2. Remove the power cord and battery
3. Hold the power button for 30 seconds
4. Replace everything.
Sorry again, for I know how frustrating it can be.