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Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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Power to USB, thunderbolt ports, but no signal or data transfer

There is power flowing through the USB Ports. I tested that with a USB tester and am getting the standard 5v of power.

When I connect a variety of mice or keyboards or other USB device I can get response on the actual devices (i.e.: mouse lights up, keyboard power LEDs illuminate). There is no reaction or response from the computer. The iMac starts up just fine, but the mouse pointer stays in the top left corner and will not move. No keyboard response.

I can't do any kind of test (i.e.: AHD) or enter single user or target mode without the keyboard.

There is nothing in the optical drive.

I would normally do a system profile check to find the missing components, but since I can't choose an account or type the passwords, I can't get past the log on screen. That's as far as it gets.

I have tried:

• a variety of USB keyboards and mice

• removing the harddrive to see if it would read to:

— an external hd with Mac OS

— an external cd drive with a Mac System Disc

— a bootable USB flash drive with Mavericks install

• target mode

• external monitor via thunderbolt

• connecting another mac via thunderbolt

Still nothing.

Please help.

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If you have access to another Mac you could connect the two Macs in firewire target mode then load your iMac OS on the other Mac, activate the bluethoot, then restart your iMac and use a bluethoot keyboard and mouse to check what's going on with the USB. Your USB power line seems to work but the data lines are out. You can try a PRAM reset and SMC reset with the bluethoot keyboard.

http://forums.macrumors.com/showthread.p...

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I have the same issue. Did you find a fix?

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Chris Leeds 将永远感激不已
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