Will not restore & shows only Apple screen

I have an iPod classic 160gb thick 2007. I recently had trouble with it and had to restore it. It worked for about a month then I would get the Apple icon but no menu. When I plug it into iTunes, iTunes does not see the iPod. I hold the buttons to restore the iPod and one in six times iTunes sees the iPod briefly and tells me I need to restore the iPod. I follow the instructions and I get a black and white screen (on the iPod) that says "Do not unplug, iPod is restoring." But this print is much smaller and it is in black and white with a small updating arrow circle in the upper left hand corner of the iPod screen. I can leave it restore for days but the screen does not change. The iPod makes clicking sounds but does nothing. I disconnect it form the computer and I get a black and white check mark that says "OK to disconnect". It stays on this screen until the battery dies several days later (unless I have it plugged into charge but I never get the main menu). When I connect the iPod to iTunes and iTunes does, finally see the iPod, and I am able to click on the restore button, I received a message saying "iPod could not restore Error 1439". What is wrong? Thank you.