3750 not booting, no led light

[Ivan Marinovic]

Hi,

I have a strange problem with 3750 switch. Due to last electric failure switch won't boot, there is no light, no output to console, but you can hear power supply and sound of ventilators inside. I change the power supply and still same.

I left it unplugged 12h and it boots normally, all lights are working normally. after two hours of working I disconnect the power and start it over and again it will not boot up. no output to console no lights only fans are working. I left it unplugged and the next day it starts up normally.

Did someone experience sam problem? any advice?

Best regards,

Ivan

[Leo Laohoo · Accepted solution]

FN - 63745 - Cat3K Might Fail to Boot After a Power Cycle

[Ivan Marinovic]

Hi Leo, thank you for very fast response!

Best regards,

Ivan

[bavilaCSA]

Hi Leo or Ivan, 

The original link to the other post, which includes the solution is closed. 

Do you have still have access to the solution. I am experiencing the same issue. Power supply looks good but after major electrical issues, the switch is not coming back online.

Thank you!

[Ivan Marinovic]

As I rember there is some issue with some versions of 3750, but unfortunutly we are late for official Cisco replacement :( So we buy new UPS, and one spare used Cisco 3750. So far it is working :)