Nikon D50 SD/SDHC card problem?

Hi there… Just got given an "old" Nikon D50 without an SD card… Went out and bought a 16GB extreme SD card. But went I put in the camera I just got a Flashing (HR) With no possibility to reformat the card. I tied an Old 1GB SD for my kids camera and it worked… Went back to the shop to change the SDHC to an ordinary SD… But they only go up to 2GB… Which for a D50 is strange… Any Idea's what could be the problem… I tried various cards I have at home and the only one that worked was a simple SD.

The D50 only takes SD cards
there may be a firmware update that can have it use SDHC, but right now SD is the only card.