IMac Won't Boot With USB Keyboard Connected

We have a suite of 10 iMacs (10,1 - 21.5 inch), but one of them will not boot and has issues coming out of sleep while a USB keyboard is plugged in.
Have tried swapping the keyboard with another iMac - the other iMac still boots but the problem iMac continues to play up.
Tried plugging the mouse into the iMac's USB instead of the keyboard's.
Tried SMC reset, PRAM reset.
Re - imaged the machine from a time machine backup of one of the other iMacs, which made the issue go away for about a month... but then it returned.
Using a magic keyboard is fine as a workaround, but the users need the number pad, and if possible I'd rather fix the issue than buy a clunky separate keypad.
Does anyone have any ideas? Any help would be very appreciated!

Hello strathglass
The same thing can also happen with other connected devices such as external HD's and iPods, the Startup Manager is lost and searching for a boot volume.
1. You may be able to fix it by going to: *System Preference / Startup Disk* and select the *Mac OS X 10.5.5 on Macintosh HD* then *Click the lock to prevent further changes.*
2. Leave those devices that cause boot issues disconnected until the iMac is up and running!
3. Only sleep the iMac, and be sure to disconnect those devices be for shutting down or updates that require a restart!
As a habit, I have always ejected and disconnected all mounted USB devices (flash driver, iPods, cameras, card reader, etc.) from my hub be for sleeping, restarting or shutting down...
Dennis

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IMAC won't boot with USB card reader attached

My quite new 24" iMAC won't boot if I have a USB card reader attached:
I get to the white screen with the apple logo, but it gets stuck there and the little spinning gear below the apple logo never appears (I've waited several minutes). (In all my test cases, there is no card in the card reader.)
I've tried two different card readers with the same results ("iDOTconnect" brand and a brand new Apacer unit, both are USB2.0 multi-format card readers).
The 1st one I tried via a USB hub, the second one I tried via a new hub and also directly connected to the mac (both of those hubs work fine).
Anyone have any ideas?
Regards,
Strathglass
Message was edited by: strathglass

Hello strathglass
The same thing can also happen with other connected devices such as external HD's and iPods, the Startup Manager is lost and searching for a boot volume.
1. You may be able to fix it by going to: *System Preference / Startup Disk* and select the *Mac OS X 10.5.5 on Macintosh HD* then *Click the lock to prevent further changes.*
2. Leave those devices that cause boot issues disconnected until the iMac is up and running!
3. Only sleep the iMac, and be sure to disconnect those devices be for shutting down or updates that require a restart!
As a habit, I have always ejected and disconnected all mounted USB devices (flash driver, iPods, cameras, card reader, etc.) from my hub be for sleeping, restarting or shutting down...
Dennis

MSI P43 won't boot with usb devices connected

My system:
MSI P43 Neo
Intel Core 2 Duo E8400
NorthQ Black Magic 850 watt PSU
Corsair 4 x 2GB ram PC2-8500 1066MHz
Seagate 320 GB hd
Hitachi 1 TB hd
Samsung 1.5 TB hd
Club3D Nvidia GTX275 1,75 GB
Samsung DVD Write Master
When i try to boot i freezes at the detecting usb devices when i have a usb device connected. It does with any usb device. But when i boot up without any usb devices connected then i boot fine and i can connect the devices right after the detection of usb devices. How can that be?

Googled on "computer not booting with usb code 6b38" and found this:
Quote
****SLOW BOOT-UP in POST SCREEN****
P.S. If you see the BIOS code 6B38 in the bottom right corner of the screen, this is a indication that USB Legancy support is enabled in the BIOS. If this is enabled and you have any usb devices attached such as a external USB Hard drive, your system will take ages to go through the POST boot screens.
So disable this setting in the BIOS and the system will then boot in a matter of Seconds
From:
http://www.rebelshavenforum.com/sis-bin/ultimatebb.cgi?ubb=get_topic;f=30;t=000250
Also try and see if a clear CMOS will help, some people suggested that from a old post from MSI forum here, saying its bios 1.3 thats bugged.
So if disabling doesnt work, perhaps down/upgrading BIOS might.

P7N Diamond (still) won't boot with USB Keyboard

Hey everyone, I have my box up and successfully running now, thanks for your help. I have 2 remaining issues. The motherboard will not post with my USB Saitek Eclipse I keyboard plugged in alone, I have to plug in a PS2 to get it through Post, then switch it out.
Also, almost every time I cold boot, I get a message that says, "Operating System Not Found." When I reboot, it works fine.
I've read through previous posts, but nothing seems to directly address my issues. Do you think the keyboard thing is a wait-for-BIOS-updates fix? Has anyone else successfully booted with a USB Keyboard on a P7N?

Quote from: h311b0y on 01-May-08, 08:19:09
Hey everyone, I have my box up and successfully running now, thanks for your help. I have 2 remaining issues. The motherboard will not post with my USB Saitek Eclipse I keyboard plugged in alone, I have to plug in a PS2 to get it through Post, then switch it out.
Also, almost every time I cold boot, I get a message that says, "Operating System Not Found." When I reboot, it works fine.
I've read through previous posts, but nothing seems to directly address my issues. Do you think the keyboard thing is a wait-for-BIOS-updates fix? Has anyone else successfully booted with a USB Keyboard on a P7N?
The only time I had an "OS not found" error was when bios for some odd reason set first boot priority to the usb port on my dell monitor as well as other usb devices before my boot drive. I changed boot priority and it went away.

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I see from other postings that this isn't too uncommon, but didn't see any fix.
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Can you determine if it is just one of the hubs? Resetting the PRAM probably didn't have anything to do with this problem but the SMC controls the power, try this reset:
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
The 5 second timing is important to a successful reset.

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Hi everyone,
since I installed my BootCamp partition I encounter a strange problem. I have an LG external DVD-drive connected via USB to my iMac. Everytime I try to boot Windows while the LG is connected the boot process just stops and gives me a white display. If I unplug the drive from the USB-Port everything works fine, and once windows is booted I can even reconnect the USB-drive and it works fine. But as you might understand always unplugging and plugging really gets to my nerves. I know of a couple friends who encounter the exact same problem, they also complain about this...
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I think your best bet is DiskWarrior from Alsoft, you'll need the CD to boot from if you don't have another boot drive...
http://www.alsoft.com/DiskWarrior/
Your best bet is DiskWarrior, you need the CD/DVD though.
http://www.alsoft.com/DiskWarrior/
But others that may work…
Drive Genius…
http://www.prosofteng.com/products/drive_genius.php
TechTool Pro…
http://www.micromat.com/index.php?option=com_content&task=view&id=31&Itemid=83
BTW, you might enjoy these DiskWarrior review/recommendations...
http://discussions.apple.com/thread.jspa?messageID=9645801&#9645801
http://discussions.apple.com/thread.jspa?messageID=10541019#10541019
http://discussions.apple.com/thread.jspa?messageID=11918925&#11918925

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Raja,
Do a SMC reset perhaps even a couple of times and see if that helps. Also in System Preferences + Startup Disk make sure the internal HD is selected.
SMC RESET
Shut down the computer.
Unplug the computer's power cord and all peripherals.
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
Press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
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Okay, I'm back with good news: I have found two remedies for the problem which will hopefully solve it for you as well.
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Hello rameta,
It may help to reset your Mac's SMC and PRAM.
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Reset your computer’s PRAM
http://support.apple.com/kb/HT1379
Cheers,
Allen

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Voila, I have a Satellite Pro Sp6100, when i try to boot it whith an usb printer plugged in, the notebook won't start at all. i have latest bios version 1.90.
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Barzot @+

Hello
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IMac Won't Boot With USB Keyboard Connected

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