The first is back light failure caused by the tube or the inverter[power].
To check this run the thing and try to see if images appear - that is look at screen from an angle rather full on.
Images there but not illuminated-would confirm this.
Second the card may not be connecting correctly.[Compact flash with their many pins are prone to grot in slot to pin breakages.
The card itself may not have loaded correctly.
What are the instruction with regard formatting in your particular device?
If all else fail- it will have to go back for repair/replacement- Even out of warranty stuff- the retailer has a six year obligation to take care of the device Sale of Goods act -[Google BER]- though this may entail a repair fee.