Laptop screen not working, audio buzzing

Hi,

I have been using for a while a Toshiba Satellite c650 laptop. It has been used only to listen to music and to check e-mail via Internet Explorer. Recently, after a short camping trip where rain was abundant, the screen stopped functioning. The computer was working, we could hear the music playing. After shutting it down, turning it back on would make the screen work for anything from a few seconds to a few minutes. The screen then remained pitch black, whatever we did. I finally had the idea to plug in my 27-inch external monitor.
The results weren't as good as I expected. The external screen works fine, but the resolution cannot be set higher than 1366x768, instead of the usual 1600x900 on the laptop. Also, when connected to my Alienware laptop, the external monitor can go up to 1980x1080.
As if this wasn't enough, when playing music, the speakers would suddenly let out a very loud buzzing noise for a few seconds. We have tried to pinpoint the cause, but it happens whenever it seems to want to.

Is there anything we can do about the screen? (without sending it to be repaired, of course) I guess there's a problem in the hardware, because the external screen works. There might also be a problem with the video card, because of the weird maximal resolution..

Please, any help or advice is gladly accepted.

Nazsha

The external monitor cannot go beyond 1366x768 because (probably) you're connecting it to a port that's used for projectors.
Question: If you shine a bright light into the laptop's monitor, can you see anything? (if yes, then it's just the light source that went pfffzt)

Without sending it to be repaired you'd have to repair it yourself. Which means using tools, taking measurements then sending them back and forth through a forum. It'll probably take weeks and it might cause more damage.

Hi,
I don't know if the port is supposed to be used for projectors, it's the only VGA port on the machine. I use the same plug when I connect that screen to my Alienware laptop, and the resolution is OK.
Also, yes, we can see something when we shine a light into the laptop's monitor, so I guess we'll have to have it repaired, or simply keep using an external monitor.

If you have a friend you can call who REALLY knows a thing or two about hardware (or if you know a thing or two about hardware) you might attempt to replace the backlight yourself.
Here's a small guide:
Laptop Repair Help » How to replace laptop backlight lamp (CCFL)