Have a satellite m305-s4910. Screen was very dark, except normal when open only a few inches. Took cover off screen. If I move a bundle of wires wrapped in black tape at the bottom left side of the screen forward into the slot where the screen cover would rotate, the screen is fine in the open position. Seems to be a problem with the screen close sensor, but I can't find the sensor. Any help appreciated.

Either it's getting to hot or you have gotten infected, try cleaning the vent with canned air... if you can run a virus scan, Older Toshibas are notorious for getting hot...

remove the battery pack and power source. make sure nothing is plugged into the laptop. hold down on the power button for 30 seconds. then reinstall battery, plug the the adapter into a known live power source (the real reason for your problem) and power it up!

My M305-S4910 was doing the same thing. After some research, I replaced the video cable. The flickering was not as bad, but still there. I just replaced the inverter, and the pink line beneath the toolbar is now gone and so is the flickering. :-)

Hi. The flex connection are loosen inside. There is no way to fix this at home.
Unfortunately I had the same issue and I had to sent my computer to the factory for repair.

Vince

There is a possibility that your screen backlight has malfunctioned. go get it replaced. that should solve your problem.

the bios is the operating system in the chip attached to the mother board
It is the primary system that gets the computer working (turns on all of the right electronic switches so to speak to boot up and power on)
It never needs up dating and the confusion is caused by the updating references to the operating systems ( win xp, 7 8 vista etc) which are not the bios

I have a M305-S4831, the screen started flickering a couple months ago and it seemed that the problem was related to the position of the open screen.

Somewhere I read that the cable connector has very tiny contacts and one may need a new monitor cable. Well, this is what I did with fantastic results:

1. I removed the 4 screen frame screws which are under the 4 plugs.
2. Carefully remove the frame, there are the normal plastic snap into place clips around the frame on all four sides. Use a very thin screwdriver or knife blade to get the first of the clips to release then just keep going around until all clips are free. CAUTION: the wireless antenna cable goes along the left side of the screen from bottom to just around the top left corner.
3. Notice the cloth covered cable on the left side that ends with a white plastic plug set. Mine was "secured" by a small piece of yellowish scotch tape.
4. Gently unplug the connection, I used my fingernails ever so slowly to get it apart, then reconnect together. This 'scrapes' the contacts clean a bit.
5. Get out your favorite hot glue glue gun and heat it up. Then I just hotglued the cable to the cover inside surface for about a half inch distance backward from the white plug. I secured not only the cable but also a bit on the connector itself as well.
6. Now when I open and close the lid, the cable end is fully secured but the cable is still free to twist as required.
7. Restart the computer and check your screen by carefully moving the cover...the screen should not flicker any more.
8. Reinstall the monitor frame and 4 screws and plugs.
9. Enjoy a normal monitor.
10. I did not want to buy anything, and I figured I had nothing to loose by trying this. So far it has worked for me.

Are you in windows 7? If so, hold the windows key and press P. Select the monitor output configuration you want (being careful to make sure you can still see the screen on something).

If you lose the screen entirely, unplug the vga cable and reboot the computer.

Remove the power strip above the keyboard and the keyboard and remove the bezel on the LCD. This will give you a clear view of the wiring leading from the screen to the motherboard. Look for a loose connection or rubbed or frayed wiring. Also, a lot of video problems are from the cable getting loose that runs from the back of the screen. This is a flat cable the fits in a socket on the back of the screen.

Here is the lcd removal duide for your laptop....

http://www.irisvista.com/tech/laptops/Toshiba-Satellite-M305/remove-screen-inverter-video-cable-1.htm