Why doesn't my laptops screen randomly not turn on after blacking out...?

Its only 4 months old and its an Acer Aspire. I've changed the settings to 'do nothing' when i close the lid so it doesn't sleep or Hibernate if it goes black it some time just doesn't turn back on again (not time base since once i left it on for like a day and it turned back on but didn't one time after 30 mins..?) i know its still working coz it makes clicking noises and things, but the screens just black i talked to the IT ppl who told be 'Windows Laptops JUST do that' ¬¬ my previous 3 year old laptop never did that... help its driving me nuts... v.v Thanks