I havea ipod touch 2g i was trying to jailbreak and when i tried putting it into dfu mode it locked up, i can'?

It seems like your iPod is still in DFU mode. Hold both the home and sleep/wake on for 10 seconds until an Apple logo comes up. If it doesn't come up, then try holding the home on for 10 seconds, both home and sleep/wake for 15 seconds and just the power on for 15 seconds. Hopefully this works!