See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
For a laptop, or netbook, you must remove both its main battery and AC adapter before you do that.
For a brand name computer, see the Owner's or User's manual if you need to - how to remove or replace the ram is usually in that - it may already be in your installed programs. If you can't get into Windows, it may be on a disk that came with the computer, or you can go online and look at it or download it - it's in the downloads for your specific model.
If that doesn't help....
Since the last time this laptop worked correctly, have you, or is it possible anyone else has
- dropped this laptop,or otherwise subjected it to a physical jolt ?
- spilled liquid on it, or exposed it to liquid such as rain, or have you sprayed it with liquid (it doesn't matter if it was running at the time or not) ?
If the answer to both of those is definitely NO, since the last time this laptop worked correctly,
- has there been a power failure event ?
If the answer to that is definitely NO, have you reloaded Windows from scratch since the computer last worked properly ?
If you HAVE, you must load the main chipset drivers after Setup has finished, otherwise the ACPI features of the mboard (Standby, Hibernate, wake on....) may not be recognized properly by Windows.
When you have problems with the built in display, it's usually after a lot more than two years, unless the laptop has been damaged, and you usually get a BLACK screen (no display) or a very dim screen, NOT a white screen.
Try connecting the computer to an external monitor to see if you have the same problem with it's display.
Laptop no video (or video problems), and battery, AC adapter, power jack T shooting.
See response 1:
DO NOT plug in or unplug a monitor's video cable into / from a video port while the computer is running. Doing so can damage the monitor's circuits and/or the video adapter's circuits.
Some laptops will display on an external monitor without you having to do anything.
If you get no video on an external monitor, some laptops have a key combo that you must press to toggle the display to external video only / built in display video only / sometimes both - see the Owner's or User's manual for the model.