Iphone 3G: does not turn off - no stand by modus

I have a jailbreaked iphone 3g.
The iphone cannot be turned off. If I press the power/standby switch nothing happens.
If I turn off the phone through SBsettings at first it seems it is turned off, but after a few seconds the apple logo appears and doesn't disapear anymore - a few seconds you see a black screen and then in a few seconds black screen with the apple logo. This goes on and on and on...until the battery is empty.
When it is connected to electricity the same thing happens - with the exception that it goes to the mode in which the "turn-off" bar appears. But if I want to turn it off the same circle starts.
I am guessing that the whole problem could have something to do with apps I installed through cydia...?
Any ideas?

No support for jailbroken devices can be given here.

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