After install Centos 6.3 from USB, it doesn't boot

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http://unix.stackexchange.com – I installed CentOS on my machine from my USB. I did a minimal CentOS USB drive with UNetbootin. After I install the CentOS, when i try to reboot, it does not starts. I have only the cursor blinking on a black screen. Note: If I install the boot loader on flash drive, the system starts correctly when the USB drive is plugged in. But if I install the boot loader on HDD, I can't boot. Can anybody help me on solving this issue? (HowTos)