Burned CDs saying they are blank

[doenova18]

So I have been looking around and trying to find a solution to my problem.  None of the answers seem to be working.

I bought my laptop (toshiba m200) while I was living in Korea.  Thus, all the cds and dvds that I used to burn were from Korea.  Now that I am back in the US, my computer will no longer burn cds or read any cd burned in america.  It can read all the cds that I burned in Korea still so I am a little confused.  It can read dvd movies and music cds, but nothing that is burned.

I had the computer search to make sure the driver is running correctly and is up to date (it is).  I checked the region and that is fine. 

Does anyone know what else I should do?

[patio]

What application are you burning with ? ?
Are you finalising the burns ? ?

[doenova18]

The cds have been burned by different applications.

I have some old photos on a cd.  I have cds that are music files burned from a friend's computer.  I have cds with pdfs burned from my work.  None of them are reading on my computer but ork on others

[patio]

Then it's probably a burned out read laser in the unit...

[doenova18]

See i thought about that.  However it doesn't make sence because it is only US burned cds it won't read and burn.  the cds from korea work fine.

[Dias de verano]

it is only US burned cds it won't read and burn.  the cds from korea work fine.

Different CD brands?