Do you have a spare SD card you could use to build a second Noobs SD.
It would need to be an 8 Gig.
This would be the fastest way to try and eliminate problems without wiping your existing SD.
Having said that you have come to the right place to find answers so stick with it and we will try and figure out what is wrong.
If you only have a 4Gig you could build a wheezy.
To try and help we really need to know the approach you have taken.

Noob is not derogatory the noob is just the lower end of the noob--geek spectrum being a noob is just your first step towards being an uber-geek
If you find a solution please post it in the wiki the forum dies too quick