I have several vertical multicolored lines running through the screen on my laptop (qosmio g25 av513). These lines are present at all times. Two lines create a block approx. 3 in wide and cannot see behind this block. can this be repaired by screen replacement

The Toshiba Qosmio G25-AV513 supports a maximum of 2 GB of RAM, not 4.

that would mean its the lcd or cable ribbon bad idea to buy a used lcd!if its your video card would also show lines on monitor thats good!

try connecting to external monitor no issue means lcd panel or connector

try contacting toshiba support at: http://sdd.toshiba.com/main.aspx?Path=ServicesSupport/ToshibaDrives/TechnicalSupport

Means you network card has somehow got weged out and its halfway in, halfway out.
You would have to open up the laptop and make sure everything is pushed in.

Following factors could be causing this problem and solution as well:

1) Cable Cut: check is to see if the cable between the screen and laptop is pinched or cut. Every laptop has this wire that runs through one of the hinges

2) If this problem temporary i mean for some seconds then it could be a short signal cut problem to screen which causes screen distortion

3) Connect an external monitor and restart the laptop. If you see the same strip on the external video, then that is the motherboard or the video card problem in case you have a video card on your laptop apart from integrated graphics chip

Try the link . . . www.laptop-problem-solution.com

For find your best solution.

21

Try the link . . . www.laptop-problem-solution.com

For find your best solution.

28

this indicates you have a bad screen, and if you press around on the back (top) of the computer display the lines will disappear until you take your hands off the area effected, and the screen needs to be replaced.

try the following
update your video graphic drivers,
try with another ram,
if still you have problem try to repair or reinstall the os