hard reset problem MDPNA100

I have done a Hard reset on my pocket PC MDPNA 100, but it won't get back online. I don't know if I need a special reboot program etc. If I hold the power button a small prog tries to boot from MMC/SD card slot etc... but I don't have any boot progs. If I hold the reset key I just get a blue screen saying what boot prog is running, Do I have to wait until it reinitialises itself? Nothing seems to work... Medion have no help on this so I was hoping that some smart dude could help me. Thanks in advance