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Server hung with the message "Caution : Machine Environment : Power Enclosure Overheating", why ?

Solution Verified - Updated 2011-10-21T09:21:07+00:00 -

Issue

Server hung with the message below, it had to be rebooted to bring back to normal operation, why ?
```
Caution : Machine Environment : Power Enclosure Overheating
```

Environment

Red Hat Enterprise Linux 4.7
HP ProLiant BladeSystem with 1U Power Enclosure.

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