I just trasfered some elfs to my phone's memory card (with windows explorer). When I unplugged my phone the screen went black and stayed that way. I reinserted the battery and turned it on again. After I typed my PIN and the startup animation played and the screen went black. If I slide my phone or press some buttons it lights up (kind of as usual I think). What just happend??

u havent followed the tutorial properly..??
or
may be some conflicts with patches ??

what are the patches you have used ??

Have been following every tutorial properly. The phone has been working fine for a long time just until now. Only patch I've applied is the ElfPack (following this tutorial: http://www.sliderwithstyle.com/node/29)

Been testing a bit and it appears that the problem is that the SE-lifestyle Deskbar elf chrashes when the phone starts. Without it in the daemons folder it works fine. Is this a known problem? Maybe the elf file has been corrupted when the phone was (dis-)connected to the PC?

may be.. try downloading from another source and try ..