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4900 fails POST

4900 fails POST

4900 fails POST

I installed a 4900 1000BaseT ethernet switch over the weekend, there are 3 4400 switches with gigabit uplink modules connected to it's ports.

It worked fine at first, but after 5 minutes or so, the packet status LEDs for the connected ports stopped flickering and stayed on constantly.  At this point the switch stopped working.

When the unit was power cycled it fails the POST test - the power LED is yellow, the only other LEDs on are UNIT LEDs No.s 1, 3 and 4 (the switch is not in a stack).

OK, so I contact 3COM and their answer is to send me a replacement.  It arrived yesterday, I put in in last night and guess what.... the SAME THING happened.

Am I just doing something wrong? could it be one of the 1000BaseT modules in the 4400's that's causing the problem?  The switches are in a proper rack, with cooling fans etc.

Please can somebody give me some advice before I throw these things out of the window.


RE: 4900 fails POST

Hi DevonBoy,

I have faced some similar problems. I advise you but cannot guarantee you that it will work. Restore all the switches to factory defaults. Load the latest software in all the switches. Also the software loaded in all the switches should be of the same version. Actually this is not necessary for your switches to work. But when i faced similar problem and when my network got down a couple of months ago..... i did the same thing and till today i have not faced the problem.


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