Connect the Device, and hold home while doing so for around 10 seconds. It should pop up in Restore Mode. As iPT's cannot be bricked, it is probably on, but as WinPWN adds custom icons, they may not have made it, keeping the boot screen blank. If you manage to get it into Recovery Mode or even DFU, iTunes is your best buddy for restoring and fixing up your iPod.
Cheers and hope it works!
allbrokeup