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I have been having this major issue for the last few hours now. I have a system x 3550M2 server and I ran the UEFI and IMM firmware upgrades within Windows Server 2008 R2 x64.

All upgrades went fine and I was told to reboot. I performed the reboot cleanly using the OS restart option. Upon restarting it showed the system initializing screen and it stayed there for a good hour. After that hour I figured it froze and so I powered down and powered up again.

Now I can not boot back up to even see the IBM splash screen or the OS... I have tried switching the Jumpers to go to the backup UEFI and backup IMM and no luck. I have also reset the CMOS power and I have pressed the reset button 3 times on the light path and no luck. There are no lights light on the light path to indicate anything is broken. The only thing I see on the light path is the number 0.5. Any ideas? I am quite stumped with this problem.

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don't forget unplugging from power - this is not a joke. unplug the machine from the outlets for at least 30s.

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+1 for that! After administering bunch of xSeries servers for years I can tell you that many mysterious problems disappear after unplugging the machine from the outlet for a minute or so and plugging it back in. "Mysterious problems" including "hard server freezes" and "degraded performance". – Janne Pikkarainen Aug 1 '11 at 12:42
confirming PFO answer after software reboot, have to power cycle the server netcomp – user169538 Apr 15 '13 at 5:57

Pull the CMOS battery for 5 minutes, then replace the battery and try starting the system again.

If it still fails to boot, call IBM for hardware support (+1-800-IBM-SERV).

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Power off machine and press F1 while booting. As you saw, it will be ok.

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