I would try to hook up a monitor to it to determine if it is just the screen or worse. There is a toggle button you usually have to use to activate the external connection. I'm not sure what the toshiba uses. i have an HP & it uses a combo of the blue key / F4 to toggle the screens used. Also sometimes rotating the screen at different angles will temporarily help if it is a faulty connection.
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Does it make a beeping sound when you turn it on? If it does try this:
Turn it off and take the battery out for about 2 minutes. Put the battery back in and press the power button to turn on. Immediately tap the F8 key on your keyboard. This should bring you to the advanced boot options. Choose last known good configuration.
If that doesn't work you may also try choosing system restore in the advanced boot options and follow the instructions. Note that a system restore brings the computer setting back to a previous restore point and will removes all changes after that chosen date.
I hope this helps.
when it goes to the black screen give it a few seconds after the mouse shows up. Ctrl+Alt+Del and select task manager, then select the process tab. click on explorer, then right click on it and select end process from the pop up menu. once it has disappeared go back to the first tab programs. click new task, type explorer and hit enter. see where it gets you from there. if that doesnt help please recover your computer per manufacture instructions.
have you pulled out the battery as well or hold down the power button for 10 seconds, then try it again. that did it for me just a thought toshiba told me too pull out the battery once it was going then put it back.... sorry am not an expert
While turned off..You could take out the CD/DVD drive, HD, all the memmory(1 or 2 modules) and If you know how, even BlueTooth and modem and WLAN mini PCI/PCIE modules. Then try to start it. If you hear 2 beeps followed by any other numbers of beeps(2_x_x)...then you can be rather glad that your motherbord (still maybe!) works ok. If you hear other kombinations of numbers of beeps(1_x_x, 3_x_x or 4_x_x) then you may have problem with the motherboard :( .. in case you hear the 2_x_x beeps you have a memory problem..shut down the laptop...now put only one of the memory modules(if you have 2) and boot up...if you get the picture you should be able to see any BIOS POST warnings/error messages..if you still hear the 2_x_x beep comb. you have a memory problem..then you should buy a new memory! if you dont see any picture on the screen it could be the Graphics card problem or yet another indication to memory problem...if you get sure that the memory and the motherboard are ok then put in the components back in and boot after each to figure out witch part is problematic...
Try booting and entering the Bios settings, generally you hit delete while the system powers up, if the screen works fine here it is probably a windows resolution issue. You can press F8 before the system tries to load windows and enter safe mode. Reconfigure your resolution here and try it again.