I found the problem.
It was a problem with Priiloader.
this treath can be found on this site (hope it can be posted)
HOWTO: Install Priiloader to help prevent system bricks if you cannot use Bootmii as boot2 Ade's Softmodding Wii blog
look in this section :
"....There is currently a big affecting some Wii consoles where even when setting the system menu as the boot option, the wii will continue to load priiloader first. Download a beta of v.03 from here which should fix it:2shared - download Installer.dol
rename the installer.dol to boot.dol and install over the top of the old version...."
So I hope this will help others to solve the problem.
greetz and thanks