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If this is a new laptop barely months old please contact the place you bought it. You will have a warranty on it, you will be able to get it replaced under warranty. It would be pointless anyone trying to help you fix it as it may void your warranty
It should be a Problem of a loose conection.
if you feel you are good to take it apart there are a lot of tutorials on the web in how to take it apart and reattach the flex cable. (maybe even change it)
otherwise take it to a laptop specialist
Look closely at the area where the computer "folds";
there's a small sensor that should trigger when you *CLOSE* the lid -- perhaps, something is triggering that sensor (a small pin) when you're exceeding 90 degrees, putting the computer to "sleep".
Your laptop either goes to hibernate or sleep mode when you close the lid. Then, when you open the lid up, the screen is still off because your pc already hanged/froze and could not wake up at all (usual problem in vista). Off course, hard shutdown would fix it. But actual fix is under power options on your control panel. Check your current scheme and edit it. There are options there that you can select to "do nothing when closing the lid"
This is definitely a loose connection problem.
Does the screen go completely black or just a part ?
If its just a part, LCD is defective. You may have to change the whole LCD screen. You can get one for ~180$ from ebay
If the whole is turning off, I guess the power cable might be little loose.
You can open the LCD panel and check if you know what you are doing.
Else take it to a normal technician and ask him to open the LCD panel and see it.