6550b replacement screen 1600 x 900 not working.

I have a HP6550b and the original screen has broken.
The original screen had a resolution of 1366 x 768.
I read from the specifications that this laptop can also support a resolution of 1600 x 900.
However, if I try a new screen with the 1600 x 900 resolution it will not work properley.
I get compacted vertical lines, blurred text and the colour is predominantly pink....
Does anyone know why this is happening..??
I do not see any special video cables for this higher resolution, the specs say that the laptop can work at this resolution and I have also tried different 1600 x 900 screens in different 6550b laptops all with the same result.
Appreciate any help with this one.
thanks.

@agostini 
‎Thank you for using HP Support Forum. I have brought your issue to the appropriate team within HP. They will likely request information from you in order to look up your case details or product serial number. Please look for a private message from an identified HP contact. Additionally, keep in mind not to publicly post ( serial numbers and case details).
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Thank you,
Omar
I Work for HP

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