i made a new usbasp with ATmega8 and when i connect it to my lap and read it i got that error

" error: programm enable: target doesn't answer. 1 "

then i connected pin 25( slow clock) to GND and still not working

 

Did you use the latest firmware? What does the full verbose output from AvrDude say? Have you checked all your connections?

Have you checked all your connections again?

Have you checked all your connections one last time?

 

How did you program the Firmware to Atmega 8 microcontroller?? I think the firmware is not properly dumped into atmega 8..
post the schematic which you have used for avr usbasp

 

it's worked and back to the error again -_- and the voltage between VCC-GND at the target device = 5v !!

 

i attached the schematic and the board + i connected pin 25 to GND later

 

A quick google suggests that an atmega8 might have speed issues in this application but I guess that is why you are grounding Pin 25.

What version of the firmware? Have you checked all your connections for continuity?

 

i grounded Pin 25 (Jumper 3 in the schematic ) to get it in the slow clock as i found many suggestions to do that

firmware " usbasp.2011-05-28.tar.gz "
here >> http://www.fischl.de/usbasp/

 

and i checked all tracks -_-

 

So when you say it worked, did it actually program a chip or did avrdude just detect the presence of the programmer?

 

when i connect the programmer to the laptop it's play a sound that mean usb is work but when i trying to burn a code the error appear but while i was trying to read it that's appear

then i burned a code

after a few minutes it's back again with error -_- !!

 

The last error shows that you are programming a different chip than the programmer is told to, but it should generally work.
If it sometimes works and sometimes not you got a bad connection somewhere, or way too long wires between the prorgrammer and the target chip, try staying less than 20-30cm.