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Excessive Late Collisions on port X / Excessive CRC/Alignment Errors on port X

We have six HP Procurve 4000M switches connected via fiber on our local LAN.  We are getting complaints from users on the WAN that the network is slow.  If i browse into the main switch that is connected to four others via fiber, it shows the following messages:

Excessive Late Collisions on port X (any of the fiber ports)
Excessive CRC/Alignment Errors on port X (any of the fiber ports)

When I browse into the other switches, they have the same messages on the fiber port that is connected back to the main.

Since this is affecting our entire domain, we need to fix it.  How do we track this down?
2 Solutions
Pete LongTechnical ConsultantCommented:
4000M is quite an old beast - before you do anything upgrade the firmware on it (it will need a restart afterwards) and see if there is any Trunking turned on on these ports
Don JohnstonInstructorCommented:
Late collisions are almost always caused by duplex mismatches. I'd start by making sure the duplex is the same at both ends of the suspect links.
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