I have a had a iTunes account for a while that has been used with my iTouch. I recently even have used it to start up my iPad for downloading software. Problem is I just replaced my PC with a iMac. Now I sign into iTunes and log on fine but when I plug either my iTouch or iPad in it warns me that this device was synced with another account and basically will erase my music if I force it to sync. What is going on. I know I only have one account and I get this warning no matter if I plug the iTouch OR the iPad.