LCD is not working properly

i have a compaq presario cq40-337tu laptop with 250gb harddisk and 2gb of ram.i have windows7 32bit operating system.my laptops screen becomes very blurry or vague after sometimes of starting.This vagueness prevails sometimes and then it goes automatically.sometimes when i restart the laptop after observing the blurry screen,the very first screen--"press esc key to....." becomes yellowish. is it any hardware prolem...???????????

how do i fixed it??????do this type of problem in the LCD increases if i continue to use the laptop?????

if this type of lcd problem can stimulate others problem in processor or any other place in my laptop??????
 
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