In our environment, we have an MX65 device at one location. Internet 1 port is a static port connecting back to ISP modem.  The location changed ISP providers. The new ISP information is now DHCP. 
 
1.Set Internet port 2 to DHCP for new ISP provider
2. Went into Internet 1 port and removed static information - set to dhcp
 
Moved cable from internet port 2 to internet port 1
 
Rebooted all equipment involved
 
Internet port 1 will not come up 
 
Moved cable back to internet port 2 *network came back up*
 
No matter how we troubleshoot - internet 1 will not come up
 
Any suggestions on how to fix or point out what we are doing wrong?