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

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I have trouble after 3 hours the mouse and bluetooth stop

iMac 21.5" Mid 2011 2.5 GHz Intel Core i5

Hello,

I'm having trouble with my 21.5" iMac. After working for 2 - 3 hours the mouse with Bluetooth and USB port connected keyboard stop working.

Sometimes I can work a whole day without any problems, other times it stops and I have to restart my system to get it working again.

How can fix this? Thanks

Update (02/26/2017)

Block Image

I have this error: 4SNS/1/40000000: TH00-9.000

Answered! View the answer I have this problem too

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Have you tried running any diagnostics? How about rebooting your system and holding the 'Option' & 'D' keys to let the builtin diagnostics run

Reference: Startup key combinations for Mac

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thanks friend

i will do and see what see

thanks

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thanks so match

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Chosen Solution

Someone put in a replacement HD and forgot to add in the needed hardware sensor if they put in a non-Apple drive the system came with. Here is the needed sensor: OWC In-line Digital Thermal Sensor for iMac 2011 Hard Drive Upgrade and here is the needed steps to get to it: iMac Intel 21.5" EMC 2428 Hard Drive Replacement. You can stop as Step12 to slide on the sensor for the drive you have now.

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