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HP ProLiant ML350 G6 powerup issue

My setup: HP ProLiant ML350 G6 (2x PSU/redundant)



I present my issue in a few steps:





  1. Power cables disconnected (no power coming to server)

  2. Re-connect cables

  3. Press "Power button" -> I can see green lights, I can hear fans spinning (it's actually quite loud) and server will power up fine

  4. Now if I power down server (but keep power cables on the back as they are)

  5. Press "Power button" -> I can see green lights, but there is no fans sound coming out and server will not power up at all. All seems fine, correct lights, but no beeps and no video output on the screen. It just stays black.



In order to power up the server again. I need to disconnect both power cables from PSUs (on the back) and then re-connect them back and upon pressing the power button we are back at step no.3 and all is fine, until next restart.




I have tried following:




  • connect one power cable from mains and the other from APC -> same result

  • connect both power cables from APC -> same result

  • disconnect APC "data" cable from PC -> same result



Am I missing something here? This is very annoying when we have to remotely restart server for weekly (un)happiness of Windows Updates.




Looked at all BIOS settings but there is nothing really there that could point into this issues. There are some Power options (aka Economy settings etc) but all is left as default.



Any ideas would be welcomed. Thanks.

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