|Most more recent laptops will NOT run on the AC adapter alone. The main battery must be installed as well, and it must have at least a minimal charge. |
If your Standby or Hibernate mode is not working properly, your laptop may not come out of "sleep" mode. Try holding down the power button for, say, 10 seconds, then let go and press it again briefly.
If that works, you need to load the main chipset drivers for your model.
Laptop no video (or video problems), and battery, AC adapter, power jack T shooting.
See response 1: