HELP! Window 7 won't boot


I have new computer's problem is window 7 won't boot.
What I tried:
-System Restore won't help
-Start-up Repair four time won't help
-Won't let me access safe mode
-Memory Diagnostics's result is fine.
I've reinstalled Window 7 three times, so I thought everything's fine. Now window won't boot again. Does anyone could solve it?

My new PC build:
ASUS P8Z77-V PRO LGA 1155 Intel Z77
G.SKILL Ripjaws X Series 16GB
i5 3570k Intel
EVGA GeForce GTX 550 Ti 2GB 192-bit GDDR5
Western Digital Caviar Black WD1002FAEX 1TB 7200 RPM

Thank you,
3 answers Last reply
More about help window boot
  1. Do you mean that you fail POST, or do you just get a bsod during boot, or are you just stuck between boot and POST as the BIOS cannot locate an OS?
  2. Are you saying that the installation worked for a time, then refused to boot? Or have you never been able to boot properly?
  3. make sure with that motherboard you have the newest bios. the stock bios number is show on the first bios page. the bios updates put on new cpu code and ram code for more ram. there three new bios you have to put them on one at a time. use the usb flash back button and a usb stick. install one...boot into the bios hit f5 save the mb bios to default and then boot into windows or shut down the pc. with the new gui pc you have to drop your hard drive as the first boot device or the mb will try and boot from cd-rom or it give you hit any key to boot to the next device and freeze.
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