Restore won't complete

Question

I have an Ipod color 30gb w/ the grey click wheel. I want to sell it and clear all of the music and restore to factory settings.
The Ipod had been working fine, i.e. charging from the computer and the wall charger, connecting to iTunes, playing the music through the headphone jack, showed in my computer as another drive. This is all the things it should do.
I wanted to restore it to factory settings to remove my name and files as well as the music so I would not be passing on copyrighted material.
The Ipod was plugged in to iTunes and I clicked restore. The process completed on the computer and said to plug in to the wall charger. I plugged into the wall charger that had worked with this ipod before.   When I plugged into the wall charger I get the icon that shows to plug in to the wall charger and it won't change. I had the ipod pluuged into the charger for about an hour and a half.
Once after multiple connects and disconnects I got a check mark saying OK to disconnect. So I plugged into the computer again and the plug in icon came back. Hard drive is a replacement of 4 months and battery is new, just put in when hard drive was replaced.
I have iTunes 10.4.1 running. I have not updated since I had problems with the 10.5 version update. iTunes would not work after that update and it took me over 2 hours to get back to normal, so I'm leary of any new update. did the restore process crash my hard drive?
Any ideas on what happened and what I can do?

Answer 1

The wall charger I am trying to use is a third party, but when I bought it I made sure it matched the Apple charger current which is: 5-5.5V and1000ma. I don't think thats the problem. This is the third ipod that this happened to. refer to my original post above.
I had a 4th Gen 30GB ipod made by HP. It's identical to the Apple version. I used it for over a year and then I got the sad face icon. I found that the HD failed. I bought a replacement drive and a new battery. Reassembled with the new parts and it charged to full and was back working right. Replaced all my music from iTunes and used it for a couple of months and then got an iTouch. The 30gb HP ipod was just sitting,but working.
I bought two (a 20gb and a 30gb) that were not working and with the symtoms they showed new batteries were needed. I replaced the batteries and charged them. Both ipods charge to full and powered on. I was able to see they contained music files and other stuff. I plugged in headphones and played the music just fine. I plugged  into iTunes with the 20gb and a message said ipod was setup to a Mac computer and I needed to restore it to use with windows. I hit restore and BAM, number one ipod would not finish restore. Now the hard drive just clicks and will not boot or show on the computer. This was the 20gb.
I thought the HD failed, I didn't blame iTunes yet. I put the 30gb on iTunes, it was formated for Mac too, need to restore to use in windows, BAM number two ipod would not complete restore. The icon showing to plug into the wall charger comes up. I even replaced the battery again. Still would not restore.
I decided to sell the HP 30gb on Ebay. They don't like you selling ipods with music files so I went and tried to restore it to clean all of my files and music. BAM number three ipod now shows the plug into wall charger ipod.
I am really PO'd that 3 ipods are destroyed by iTunes restore. Now I'm mad at iTunes!
I have two other 20gb ipods that I got working by replacing the batteries. I will not run restore on them. I plugged into iTunes and manually removed the music. There is no music on them but the name of the ipod is not changed.