Can't access bios ad windows wont start

hi,
i am using acer aspire 5742-96657 laptop and i recently upgrading my bios and installed the windows consumer preview.i normally leave my laptop on but today morning as i was on you tube my system crashed and brought a blue screen with an error.the keyboard stopped functioning so i took the battery off and replaced it.After that i switched on my laptop it switches on shows the acer logo the switch off and on again.
i would be glad someone has a solution for this problem and is wiling to help me.
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More about access bios windows wont start
  1. i took out the hard drive and it was able to boot with the cd
  2. So it was the hard drive?
  3. im i to format the hard drive
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