Lenovo z 570 is'nt starting up

my lenovo z 570 is not showing any thing when its power is switched on,
i switched it to sleep mode since then it is having start up problem, screen is blank even when power is on, boot screen is also not starting,
plz tell me what to do
 
"plz tell me what to do"...
Buy a new laptop :) Seriously, you may need to take the laptop in for repair, but try this first:
Press F8 repeatedly as the laptop boots and see if you can get into the safe mode... if you can see anything. If the laptop is still dark, it is time for repair
 
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