Laptor screen flickerring- Pls Help !!!

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I own a HP Compaq 6710b laptop. I bought it in jan,2008 and till Aug,2010 it was working fine. Suddenly some days ago i noticed my laptop screen started to flicker like power fluctuations to the glowing bulb/tube tight. I tightened all the screws of the laptop and then it worked fine for a day then prob started again. I removed the power plug and worked for sometime, it was fine. Then i plugged in, it started to mess again. I removed the battery and worked on direct power, no use either. Then i opened power options and in Adjust display brightness i reduced it to minimum brightness and now for the last 2 and half months it is OK with no visible flicker problem but working on with low brightness is like hell but i currently thav no options. but now too whenever i brighten it, it starts to flicker again. Why this thing happens to me? Some tech/Professionals say, my LCD is gone and would take loads of money to replace it (u can buy new laptop with investing some extra $ instead of replacing the LCD) and some say the back-light is gone and have to tighten it if loose or replace it if gone. What could the the exact problem??? Experts? Professionals? Technicians? Computer magnets? Pls help!!