ATmega8 lässt sich nicht mehr flashen

Moin!

Ich hab seit heute das Problem, dass ich meinen ATmega8 weder auf meiner 
selbst gelöteten Platine noch auf dem Atmel Evaluationsboad von Pollin 
flashen kann. An meiner Platine hab ich heute einige kleinere Änderungen 
vorgenommen, jedoch nichts gravierendes, lediglich ein paar Pins 
vertauscht. Seitdem krieg ich in Eclipse immer diese Fehlermeldung:


Launching C:\WinAVR-20100110\bin\avrdude -pm8 -cavr910 -PCOM3 
-Uflash:w:TimerTest.hex:a
Output:

Found programmer: Id = "AVR ISP"; type = S
    Software Version = 2.5; Hardware Version = 2.0
Programmer supports auto addr increment.
Programmer supports buffered memory access with buffersize = 8 bytes.

Programmer supports the following devices:
    Device code: 0x01 = (unknown)
    Device code: 0x02 = (unknown)
    Device code: 0x03 = (unknown)
    Device code: 0x04 = (unknown)
    Device code: 0x05 = (unknown)
    Device code: 0x06 = (unknown)
    Device code: 0x07 = (unknown)
    Device code: 0x08 = (unknown)
    Device code: 0x09 = (unknown)
    Device code: 0x0a = (unknown)
    Device code: 0x0b = (unknown)
    Device code: 0x0c = (unknown)
    Device code: 0x0d = (unknown)
    Device code: 0x0e = (unknown)
    Device code: 0x0f = (unknown)
    Device code: 0x10 = (unknown)
    Device code: 0x11 = (unknown)
    Device code: 0x12 = (unknown)
    Device code: 0x13 = AT90S1200
    Device code: 0x14 = (unknown)
    Device code: 0x15 = (unknown)
    Device code: 0x16 = (unknown)
    Device code: 0x17 = (unknown)
    Device code: 0x18 = (unknown)
    Device code: 0x19 = (unknown)
    Device code: 0x1a = (unknown)
    Device code: 0x1b = (unknown)
    Device code: 0x1c = (unknown)
    Device code: 0x1d = (unknown)
    Device code: 0x1e = (unknown)
    Device code: 0x1f = (unknown)
    Device code: 0x20 = ATtiny84
    Device code: 0x21 = (unknown)
    Device code: 0x22 = (unknown)
    Device code: 0x23 = (unknown)
    Device code: 0x24 = (unknown)
    Device code: 0x25 = (unknown)
    Device code: 0x26 = (unknown)
    Device code: 0x27 = (unknown)
    Device code: 0x28 = AT90S4414
    Device code: 0x29 = (unknown)
    Device code: 0x2a = (unknown)
    Device code: 0x2b = (unknown)
    Device code: 0x2c = (unknown)
    Device code: 0x2d = (unknown)
    Device code: 0x2e = (unknown)
    Device code: 0x2f = (unknown)
    Device code: 0x30 = AT90S4433
    Device code: 0x31 = (unknown)
    Device code: 0x32 = (unknown)
    Device code: 0x33 = (unknown)
    Device code: 0x34 = AT90S2333
    Device code: 0x35 = (unknown)
    Device code: 0x36 = (unknown)
    Device code: 0x37 = (unknown)
    Device code: 0x38 = AT90S8515
    Device code: 0x39 = (unknown)
    Device code: 0x3a = ATMEGA8515
    Device code: 0x3b = (unknown)
    Device code: 0x3c = (unknown)
    Device code: 0x3d = (unknown)
    Device code: 0x3e = (unknown)
    Device code: 0x3f = (unknown)
    Device code: 0x40 = (unknown)
    Device code: 0x41 = ATMEGA103
    Device code: 0x42 = (unknown)
    Device code: 0x43 = ATMEGA128
    Device code: 0x44 = (unknown)
    Device code: 0x45 = ATMEGA64
    Device code: 0x46 = (unknown)
    Device code: 0x47 = (unknown)
    Device code: 0x48 = (unknown)
    Device code: 0x49 = (unknown)
    Device code: 0x4a = (unknown)
    Device code: 0x4b = (unknown)
    Device code: 0x4c = AT90S2343
    Device code: 0x4d = (unknown)
    Device code: 0x4e = (unknown)
    Device code: 0x4f = (unknown)
    Device code: 0x50 = (unknown)
    Device code: 0x51 = (unknown)
    Device code: 0x52 = (unknown)
    Device code: 0x53 = (unknown)
    Device code: 0x54 = (unknown)
    Device code: 0x55 = ATtiny12
    Device code: 0x56 = ATtiny15
    Device code: 0x57 = (unknown)
    Device code: 0x58 = (unknown)
    Device code: 0x59 = (unknown)
    Device code: 0x5a = (unknown)
    Device code: 0x5b = (unknown)
    Device code: 0x5c = (unknown)
    Device code: 0x5d = (unknown)
    Device code: 0x5e = ATtiny2313
    Device code: 0x5f = (unknown)
    Device code: 0x60 = ATMEGA161
    Device code: 0x61 = (unknown)
    Device code: 0x62 = (unknown)
    Device code: 0x63 = ATMEGA162
    Device code: 0x64 = ATMEGA163
    Device code: 0x65 = (unknown)
    Device code: 0x66 = (unknown)
    Device code: 0x67 = (unknown)
    Device code: 0x68 = AT90S8535
    Device code: 0x69 = ATMEGA8535
    Device code: 0x6a = (unknown)
    Device code: 0x6b = (unknown)
    Device code: 0x6c = AT90S4434
    Device code: 0x6d = (unknown)
    Device code: 0x6e = (unknown)
    Device code: 0x6f = (unknown)
    Device code: 0x70 = (unknown)
    Device code: 0x71 = (unknown)
    Device code: 0x72 = ATMEGA32
    Device code: 0x73 = (unknown)
    Device code: 0x74 = ATMEGA6450
    Device code: 0x75 = ATMEGA6490
    Device code: 0x76 = ATMEGA8
    Device code: 0x77 = (unknown)
    Device code: 0x78 = ATMEGA169
    Device code: 0x79 = (unknown)
    Device code: 0x7a = (unknown)
    Device code: 0x7b = (unknown)
    Device code: 0x7c = (unknown)
    Device code: 0x7d = (unknown)
    Device code: 0x7e = (unknown)
    Device code: 0x7f = (unknown)

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 
0.06s

avrdude: Device signature = 0x000000
avrdude: Yikes!  Invalid device signature.
         Double check connections and try again, or use -F to override
         this check.


avrdude done.  Thank you.

avrdude finished

Zum flashen nutze ich den MySmartUSB MK 2. Zwischendurch konnte ich auch 
mal wieder flashen, hab dann zum Test auch noch andere ATmega8 geflasht. 
Ich bin mir nicht sicher, aber ich glaube beim ersten Flash auf meiner 
Platine ging es, dann aber plötzlich nicht mehr.

Hoffe jemand kennt das Problem...