Yikes! 7.. Did they all go bad at once?(lightning or power surge) How long do they work before they fail? How do they fail? Quit passing traffic, but still manageable? Firmware the latest version?(assuming these will take new code) Do Cisco switches have a log that keeps any useful information?
You might be able to use Cisco TAC. Before you log a case, while the switches are up and manageable, but preferably showing the fault, hyperterminal in and from privilege mode type in 'sh tech', set up a text capture before hitting the return key, send that off to Cisco in the TAC and see what they come up with.
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