I'START'UP'THE'BLUE'LIGHT'IS'ON'BUT'BLAK'SKREEN

goos to see a mechanic

It is really a skilled work. Should be done very cautiously. You have to disassemble the set in whole to replace the LCD panel. If you wish to get some details; check the site linked here. Pull up older posts.Surf the site with patience.http://electronicshelponline.blogspot.com/
Disassemble procedure to many popular brand TVs and other devices are given in detail with illustrations

flashthe front of the lens and check if any sign of light comes through. If not, you need to change the part because damaged.

If model is as indicated here start by removing and examining the lamp that set has----shattered inside?

if u can go onlne from an other pc, i'll give u a link to the mot famous maintanance bootable cd,
Burn it, start ur acer while the cd is in the drive.
http://www.hirensbootcd.net/download.html

make sure the hose is not plugged,and if you have hard water claen the skreen,i had the same problem the skreen was plugged.

you need to repair your mobile phone but that costs more then you purchage a new one

three possibles.

connectors inside the LCD could be loose.

motherboard is unhappy.

LCD panel is fractured, even with good signal..

got a warranty?

Your LCD screen is faulty , you may have to replae it you could find one on ebay for about 20 pound ( including p&p ) if you need any instructions on how to fit it please contact me , Hope i helped :)

Very easy repair....Just replace the convergence amp board part# BP95-00142E (about $80) It includes both convergence IC's and associated components (Five connectors,one screw,easy access)no soldering...