Dell R710 hanging at boot

I have a number of Dell R710s. I have a really annoying behaviour which is when one of them boots it is hanging. They are all connected to an ATEN KVM which I swapped thinking it was my old KVM causing the issue. The hang is clearly being caused by the USB cable from the KVM being plugged in at the time of boot.
I have so far:
- Change the KVM cable
- Change the port the cable is plugged into on the KVM
- Updated the BIOS
- I think I have updated all the firmware’s (e.g. DRAC, etc.).
- Been through the BIOS on one of the working R710 and the hanging R710 and cannot see any obvious configuration differences.

Only difference I have been able to identify is all of the working R710s have a PERC6i raid controllers and the hanging one has a H700.

Has anybody seen this before or have any ideas?

Thanks
GlennCameronAsked:
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nobusCommented:
some (older) boards do have this problem - no cure  other than disconnecting usb
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HariomExchange ExpertsCommented:
Please change the boot sequence from Bios (Currently Boot is set to USB chnage from USB to SATA)

Since First Boot Device is set to USB from Bios, system is searching from USB to boot the system.

Changing from USB to SATA or IDE may resolve this issue.

Hope this helps.
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WORKS2011Austin Tech CompanyCommented:
I've seen this before on Dell's and the only thing I've been able to do is pull the USB and reconnect after the bootup, annoying but like nobus said not been able to find a solution and Dell support pretty much didn't have a solution.

Good news this is server 2008 servers, I don't believe it's the operating system rather the time (several years ago this happened more often). Hasn't happened with any new servers recently purchased.
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nobusCommented:
Glen, i am aware that my answer does not solve your problem, but it is the answer to your Question (and i know you don't like it)
but since it is the correct answer - may i ask why you gave the C grade ??
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GlennCameronAuthor Commented:
Hi Nobus, as said the original question "The hang is clearly being caused by the USB cable from the KVM being plugged in at the time of boot". No information was really given that I already had not identified and nothing to actually assist me with solving the issue, hence a C. Thanks for your answer.
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nobusCommented:
as i said - there is no solution for this problem; and that info may save you lots of time
have a nice day
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GlennCameronAuthor Commented:
Update. Disabling the internal USB port on my server has resolved my issue.
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nobusCommented:
that's what i said : disconnecting usb
of cours e if you disable the the usb  -it has the same effect
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