You can try reseting the PRAM by pressing command+option+p+r on boot.
Did you install anythnig recently?
Did anything noteable happen?
I have not install anything and do not use it online as well. I cannot find a command key on the keyboard. Please advise.
The command key should be the key directly next to the spacebar, it may have an apple logo on it, see this picture.
The option key is sometimes also labeled as "alt". This key is the one directly next to the command key.
Try running a hardware test, insert the first restore DVD and hold D while it starts.
It sounds like your HD has failed.
Thank you. I just tried, screen is still grey. I used this for music and photos and now it is not working.
How to I get the restore DVD out?
Thanks in Advance.
If you press and hold the eject key when it is booting it should eject the disk.
You can also try pressing and holind down the mouse/trackpad button as you turn on your computer.
Sorry you are having so many problems with your machine.
Did you manage to do any of the steps from the linked article?