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There are a couple of things that can be causing this, For starters it may just be as simple as unplugging the screen from the motherboard and plugging it back in. the other one would be to replace the screen you can find several screens online for this laptop. You may want to test to make sure it is the screen and not the laptop its self. To test it you will need an external monitor and then attach it to the VGA/DVI/HDMI port on the laptop and then turn the laptop off and then back on again, right after you press the power button to turn it on close the lid this will force the laptop to send video to the external monitor.
If you can see the screen then all you will need to do is replace the screen, If you get NO picture on the external monitor you may want to take it to a computer shop. More than likely if don't get a picture on an external monitor then the issue is the motherboard/ram stick.
Since you say the screen was blinking when you opened or closed the lid: 1) It could be as simple as the cable that attaches on the back of the monitor is loose and needs to be reseated (pulled out and plugged back in) then secure it with tape where the connections meet. 2) It could be that the cable from the monitor that plugs into the motherboard needs to be reseated. You'll need to disassemble the monitor to remedy the 2 problems mentioned. And for problem 2 mentioned you'll need to remove the Keyboard and Palmrest.
Have you shined a flashlight on the black monitor screen to see if you can faintly see images on it. If so, then the problem is your LCD Inverter. You can purchase them for less than $10, but you'll have to disassemble the lcd screen. It sits at the bottom of the lcd screen just above the keyboard.
If you don't see anything when you shine the flashlight on the lcd screen, then your screen is out and will need to be replaced. Get a quote from your local computer shop, then try these guys: httpp://www.generalsystemsconsulting.com They will fix it and ship it back by Fedex or UPS and beat most quotes including the shipping.
The easiest way to troubleshoot your problem is by connecting your laptop to an external monitor. WHether you have one at home, or need to take it to a friends or your place of work, start by attaching the cable to the monitor and you laptop. Then start your laptop up and hold down the fn key and press the F5 key and let go. This will trnasfer the video signal to the external monitor. If you can see the normal display on the external monitor that you would normally see on your laptop, you problem is only the LCD screen panel on your laptop and it would need to be replaced.
If the same horizontal lines appear on the external monitor, then your video/graphics ship on the motherboard has failed and you'll need to send the laptop in for repair or replacement of the motherboard to fix the problem. I send these advanced problem laptops to any of several repair vendors on eBay and have had excellent results. Simply go to eBay and in the search box type in Laptop Motherboard Repair. You will be sent to a site with many vendors there capable of doing your repair. If the prices seem to high for the relative current value of your laptop, it may be time to consider upgrading to a newer one.
Please try attaching an external Monitor to your notebook and if the white line still appears then there is something wrong with your display adapter integrated on your notebook's motherboard if not then its your LCD display. Check your Service Tag in the support and see if your warranty still active so you can have either of the 2 replace.
have you tried either switching between external and internal monitor usally Fn + F5 on toshiba or try plugging a monitor into the back and see if it displays.
if you get a display on the external monitor then its probably a screen or inverter fault if you donot get a display to an external screen then it is likley t be the graphics on the board itself.
hope this helps
Plug in an external monitor to see if it is booting normally and it is only a screen malfunction.
If you plug in an external monitor and the screen works then it's just a monitor issue. If the external monitor doesn't light up then try unplugging the power cord, taking out the battery, holding down the power button for a minute and then plugging the AC back in trying to power it up.
If it doesn't power up. Then it's probably a motherboard issue. I would get an external hard drive enclosure (2.5) and take out the harddrive and plug it into another computer to take the data off. You can then send in your computer to repair somewhere but for the price, you may as well buy a new one.
This problem is most likely to be caused by a bent or broken pin on the CRT video cable at the VGA connector, OR, this could also be caused by a damaged VGA connector on the back of the laptop.
If neither VGA connector is at fault, the problem could be caused a damaged (kinked) CRT data cable, or internal damage to the VGA connector on the back of the laptop, though I suspect the problem is more likely to be external, and you probably won't have to disassemble the laptop to locate the culprit...