Laptop Screen won't Come On. What could the Problem Be?

[oathmark1]

It's a Sony Vaio C240E. I just put in a new CPU, new RAM, new battery. I figured that would make an operational machine, but so far the machine runs all but the blank screen.



What do you think the problem is?

 

[webworkings]

Try this...

1. Turn the laptop off (not sleep or hibernate but off).
2. Connect an external monitor to the laptop.
3. Turn on the external monitor.
4. Turn on the laptop.

NOTE: You may have to press an "external monitor" button. Could be the f4 button or a button with two monitors on it, for the external monitor to work.

If you can see fine on the external monitor, then your attached display, or the ribbon cable that connects it, are your problem.

If you can't see on the external monitor at all, or the problem occurs on the external monitor as well, then it is probably the graphics card/GPU that is the problem, which may require the motherboard be replaced.