Management port will not show link - M4100

Hi

We have 2 M4100 switches. Both switches were purchsaed at the same time and set up identically.    All ports EXCEPT port 1 are in a seperate vlan that we use for our SAN traffic.

Port 1 is set to vlan 1 and is set for management.  I can no longer access the management port (port 1)  on either of the M4100s.  Can not web in, and they no longer ping.

When I go down to the switches, they do not show link.  I have unplugged/plugged them.  Tried them in different switches, and tried hooking a laptop up directly.  No link.

These switches have been up for who knows how long.  I am guessing over 2 years.   I was in both of these switche last fall with no issues.   Other than this they appear to be working just fine.  No other ports that should have link, do not have link, and the LEDs flicker with traffic.

Short of re-booting these switches, any suggestions?

Thanks in advance

Dave