Thank you for the replies. I am travelling in Marocco, and internetconnection is rare and on phone. Thank you for moving the post, I was in a hurry.
I should maybe have mentioned that I had the K-5 for several years before switching to the K-3, so I know the system pretty well, although there are a few of the changes that I have yet to master fully
Pressing menu and on did not help. I opened all gaps and cleaned the connecting areas before closing, then toke off the lens and did the same. No luck.
I have tried with an other memory card. Still nothing.
The battery is the standard that came with the camera - I never had trouble with those before - and I don't use a battery grip. It is fully charged and placed correctly
Unfortunately, I do not have an extra battery here and I am not sure I can find one. I also don't have a cable for the computer or a computer. I will try these things when I come home.
I am getting desperate,
so other ideas are welcome.
Cheers, Ida