Firstly, the battery is not holding a sufficient charge to boot because the LCD screen is constantly turning on. This causes a tremendous drain on the battery for a split second, if your battery is completely dis-charged like mine then you will never get ample charge into the battery for it to turn on hence why the screen keeps failing.
1. Open the back cover.
2. You will see 3x vertical ribbon cables. Carefully remove the on on the right, it is marked LCD (Convenient)
3. Plug your charger in and leave it to charge for at least 8 hours. (Use the wall socket adapter, it produced more current than a USB port on your computer) Now that the battery is not being drained constantly by the display the battery will have a chance to get some juice into it.
4. After you have left it to charge for some time unplug your charger (Crucial) , re-insert the ribbon cable for the LCD you removed making sure that it is in all the way so that the lines on the ribbon and the board are aligned.
5. Power on.
If it boots great. If not it may be time to purchase and replace the battery ($25 on eBay) otherwise may be time to retire it. (3 years old may not sound like a lot but in the IT world it is 2 lifetimes)