If it is only blank when you attach the card reader, then there is something wrong with the card reader. If it fine the rest of the time, I would just try using a different device to read your card. Or even leave the card in its original device and connect that device itself to the laptop to access the card.
Now if the display is now doing this all the time, not just when the card reader is attached, try the following...
1. Turn the laptop off (not sleep or hibernate but off).
2. Connect an external monitor to the laptop.
3. Turn on the external monitor.
4. Turn on the laptop.
NOTE: You may have to press an "external monitor" button. Could be the f4 button or a button with two monitors on it, for the external monitor to work.
If you can see fine on the external monitor, then your attached display, or the ribbon cable that connects it, are your problem.
If you can't see on the external monitor at all, or the problem occurs on the external monitor as well, then it is probably the graphics card/GPU that is the problem, which may require the motherboard be replaced.