Ipod wont connect to itunes, wont enter dfu or recovery mode

Ipod wont connect to itunes, wont enter dfu or recovery mode because it isnt detected when i plug it in. this all happened when i tried to restore it from redsn0w the restore didnt work i just hung there, so i unplugged my ipod and tried to put it in dfu mode because it looked frozen then everything turned black and ive tired EVERYTHING, i tried Putting it in recovery mode but it wont work, i tried unplugging plugging it back in, ive tried booting it from redsn0w, but in order to do that you need to be in dfu mode, which i cant enter, it says im not, the device isnt even recognised anymore when i plug it in 😟 please help, any and all help will be much appreciated. my ipod is an ipod touch 4th generation