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Pull the lcd monitor out of the plastic frame and check for a loose wire connection where it leads back to the motherboard. If your lucky the backlight tube wite worked loose if not you will be looking for a new lcd screen. http://www.screentekinc.com/
The laptop has to be disassembled down to the point where the palmrest, keyboard and screen are removed, once the palmrest is removed it will show the RTC battery and its attachment. Below is the service guide to show you the disassembly steps.
Yes you are correct. I would say 95% of the time, you will need a LCD screen replacement. Also be sure to disconnect and reconnect the lcd cables, at the motherboard and behind the lcd itself, just to make sure the cables aren't making bad connection.
I have provided you a link to MANY lcd screen for your laptop on EBAY.
Are these lines on the screen during the whole boot process? If so then the screen cpu and/or the video cpu has gone bad. Connect an external monitor. If the picture is clear, no lines, then the problem is the LCD screen. If the lines appear on the external monitor during the boot process then the mother board will need replacement.
Does your LCD look like this or similiar? (below) If it does, there should be a female plug similiar to the picture also below.
Hook smaller end of cable to your laptop, the other end to your external monitor. Turn on your laptop. If the vertical lines are not present then its probably your LCD, which will more than likely have to be replaced. If lines are present, then like tom19511 said it may be the video drivers. I've had this same problem with my Toshiba Satellite p35 5 times already. Toshiba had to replace my LCD each time. LCD's are more expensive than an inverter. Good luck, I hope you get it fixed.