Samsung 350E7C Bios Flash Fail

Hi,
i did a bios flash over the Samsung Live Update Tool (because of a bios problem on this notebook type, which causes system time problems), then the notebook didnt want to start. (only black screen and every 5 secunds a reboot, no response to any key)

1) I put out my HDD, no change.
2) I did a bios reset by finding the JCMOS Jumper
3) i was able to go into bios again (thought i solved the problem)
4) i put back in my HDD
5) again a black screen
6) i thought it found the bios update on the HDD again and installed it
7) i put out the hdd and reseted my bios with the JCMOS jumper
8) it worked again
9) i tried to put a simple usb stick with Windows 7 in the usb port. (wanted to have a look if i could enter the w7 setup, after formating the HDD somewhere else.
10) the notebook didnt start again. (only black screen and reboots the whole time)

I thank you for your response in advance, Andi.


[Edit]: It seems it wasn't about the usb stick, the system works EXACTLY one time after the CMOS reset. it works after "save and exit" too, but it doesn't work after completely shutting down the pc. then i have to reset bios again. why?

[Edit2]: - I think the question is: What changes in bios after first completely power off after resetting with JCMOS.
-Obersvation: The boot device Piority list in bios is empty (maybe thats one problem?)