Laptop starts to a blank screen with white cursor blink

Operating System: Windows 7 Ultimate
System Manufacturer:HP
System Model: Hp Pavilion DV6718CA Notebook PC
Processor: AMD TURION64 X2 (1.90GHz)
Memory: 2GB RAM

When I start my laptop it display the Hp screen as usual but after that instead of booting it display a blank screen with white cursor blinking at the top LEFT corner, the fan is working like... after 3 minutes of waiting the Windows 7 logo appears and Windows Starts. I thought the problem might be that the bootloader got corrupted or something, so I tried booting with Windows 7 CD both but no change still same blank screen with white blinking cursor But Now it gives me Operating System not Found after 3 Minutes Windows Starts Normally. Please note that I have been able to enter Bios setup and change the booting option as well. Bios was showing all the hardware as it usually shows. I Tried to change the HardDisK But the Problem Remained.
When I try to Press F11 recovery button it performs same thing, blank screen with blinking cursor.
I Also Tried to Format but because when i boot it doesnt take the cd and remain with the blank screen with blinking cursor. After Window Started I Entered and run the setup.exe and installed Windows again but the problem was not solved !!!

Any Help ???

Is this a brand new computer? When did this start happening?

Have you tried a repair instal?

Go to the nearest HP service center, I suspect its a hardware malfunction... zzz2496

It's probably hardware issue... This is happening before Windows loads, correct?

zzz2496