Win 7 Wont Boot.... Sometimes

I bought this Dell Inspiron laptop about a month ago. Everything has been fine. No new softrware, no new hardware, I have not made any changes to it at all. I turned it on yesterday and after the Dell logo, it went to a black screen with a blinking cursor on top left.
I turned it on and off a few times with no change. I finally got into the diagnostic screen (F8)and it did a thorough scan of all hardware. It came up clean. I shut it off and turned it back on again and Windows finally came up. I then did a scan of all windows files and that came up clean. After that I did a system restore and didnt have anymore issues with Win 7 booting up. Then about 45 mins ago I turned on the laptop and AGAIN the black screen came up with the blinking. I have no clue what else to check. I could call the place where I bought it from and Im sure their crack team would most likely find the problem only after giving up the laptop for 2 weeks which is what i was trying to avoid.
I've had alot of computers with every kind of problem there is. Never seen this.

I have Win 7 Home Premium V 6.1.7601 X64

What I would do is run Dell Factory Recovery from it's partition after making the Recovery disks to have as a backup method: Dell Restoring Your Computer´s Software to the Factory Settings

Then once you get to the desktop, immediately Clean Up Factory Bloatware which will give you back significant performance hogged by the many preinstalled programs and useless Dell utiltiies starting up with WIndows.

If this fails consider getting a vastly superior Clean Reinstall - Factory OEM Windows 7