Computer Chargers Compaq

Computer Screen shuts down, CPU still running Windows 7 updated on laptop HP compaq nc6230?

When ever i unplug my computer from its charger the screen shuts down instantly, but the computer is still running, goes to sleep mode but wont turn back on, its Windows 7 so what should i DO? its a HP COMPAQ nc6230

-Take out the battery,
-Remove main supply,
-Hold power button down for 30 secs,
-Put only power supply in, do not put battery in
-Turn laptop on
-Put the battery in.

Hope this helps

Asus G71Gx-A1 Laptop Computer