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Please test using an external monitor first,this will exclude motherboard issues if the external display is normal.Nearly all screens turning white that I have observed is a screen fault requiring replacement.
Sounds like a loose or bad cable for the display. You will need someone to do some dis-assembly to reveal that cable. Hopefully that connection will be loose and simply snugging it will fix the problem.
When you say you move him, do you mean lifting the unit and moving to another location or just moving the lid (changing angle of the lid/lcd)?
If changing the angle of the display gives you black/white screen, you may be having problem with the LCD cable, it might be loose or defective. But if moving the unit to another location gives you the black/white screen, one component of the unit might be loose. Either you need to properly reinsert the memory of the harddrive. If these simple steps will not resolve the issue then you might need to check the whole motherboard including the connection to the LCD.
Try reinstall the video drivers as it looks like an issue with the video adpater. To do so:
Start Menu> All Programs> Acer erecovery management> Restore> install Application & Drivers> Select the appropriate Video driver (Intel, NTI etc as per your computer spec) and install it. Restart the computer and check, the issue should be resolved. If not, then I am sorry I bet the computer needs repair.
Upon loading press F2 or del to enter bios setup and change the settings to display the acer welcome screen and the one you said about Microsoft logo and white box with green lines, you cant by pass it because it's windows loading screen
If moving the hinges makes the picture come and go, it would be a video cable problem. If the picture bleeds out to white, and comes back when you hold the screen sides and flex slightly, this is a faulty LCD screen. If you get the same problem when you hook up an external monitor, it would be a videocard or video-on-motherboard issue.