Thanks for using the Apple Support Communities. If you are having issues with an iPod Touch that isn't responding or won't start up successfully, you may find the information and troubleshooting steps outlined in the following article helpful:
If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support
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If I understand your problem, perhaps this article will help:
Question: i have an old ipod when i try to turn it on the screen is freezing and it shows the apple logo. I tried to connect it with my computer to update it from there but unfortunately it’s not appearing in the iTunes, so what should i do right now ?