First off, you are aware that the iPad will ALWAYS show "not charging" if it is not plugged into the official wall charger or another charger providing 10W, yes?
When connected to a normal USB port on a PC or an iPhone charger, iPod charger, etc. it will read "not charging". This is NOT a problem. It just means the iPad is not charging at full capacity. It is however charging very very slowly.
So the problem you are seeing is NOTHING to do with the jailbreak. Jailbreaking does not effect the ability of the iPad to charge in any way. I just wanted to clear that up!
It does sound as though you have messed up the device driver installation on your PC. I assume it is Windows? As the other poster suggested, try a different USB port. DO NOT use a USB hub. And make sure you give the PC enough time to install the driver. Interrupting it is one of the common things that gets folks into trouble. Try going into your Control Panel, and device manager and uninstall whatever the iPad now shows as in terms of a device. Then it should reinstall the drivers again.
Also, whilst this is only slightly relevant, I posted some details around the "Erase all Content & Settings" here:
http://www.ipadforums.net/jailbreak...ll-content-settings-jb-ios-4-3-3-warning.html
This explains why you did not see any change when you tried to clear the contents. I don't believe these options work any more on jailbroken iPad devices!