I turn my computer on and the power light comes on but the screen doesnt. what do i do?

In the first instance you need to check your power lead. Exchange it for another one that you know works.

put your vista recovery disc in it and restart it

Check the processor fixed with the motherboard properly

have you tried to remove the battery and disconnect the ac-power?

then reinsert the ac-power (without battery)
and try to boot.

if that doesnt work:
remove battery and ac.
turn computer upside down. under one of the lids there will be 1 or 2 memory modules (ram). take them out
insert ac
try to start the computer (yes, without the ram modules)
leave the computer on (with black screen) a couple of seconds.
remove the ac
insert the ram again.
insert ac
try to boot again.

take the moniter to a known good pc and see if it work if moniter works correctly it is your video card if not you need a new moniter

If that is the case your system need to check the battery for fault and does it happen with the power source too i fthe same problem check your processor fan if its bad when you on the system and is not blowing that might have cause the processor itself to get bad you will have to change this ones and then your system will be ok right rate this solution.

try selecting the dvd or tv modes ... if that doesn't help , reset the system and start all over.

I don't know Samsung's warranty policy for Australia so I'd email them right away. It could be an input voltage problem. It could be heating up components in your equipment causing it to shut down and reset when it cools off. As the green light is not even coming on may be an indiction of this. So I'm guessing you are currently shortening the life of your equipment. Rich

try resetting the player by holding the power button. your player may be "bricked" in which case you may have to get a return from sandisk.

Although you didn't list your operating system, I'm assuming it is Windows and offering a suggestion to clear up the issue based on that OS. Go to settings, and then to control panel. Once in control panel look for "power settings" and click on "custom". This will allow you to turn off all power saving modes by clicking "never" on when the screen is turned off or goes to sleep. If the issue is caused by the power saving mode, this will end the problem.