Chosen Solution
I changed the LCD on my 2011 MBA. Everything seemed fine. When I put the webcam cable on, the connector fell off so I replaced it with an I/O board from a 2009 MBA. After that, the MacBook air is super slow to boot and when I finally get to finder the cursor is sluggish and everything is lagging. So I put back the original I/O board. Same super slow response. I have tried to reset SMC, NVRAM, even if I take out the SSD and boot from a USB install it takes ages to boot. I formated the SSD and installed a fresh OS X 10.13.6. It behaves super sluggish no matter what I do. Has anyone experience this? ##update Here is a picture of the webcam cable connector fallen off
I did a hardware test. No problems found.
I think you’ll need to get the correct I/O board for your series 2011 13” MacBook Air I/O board and I would replace the I/O cable as well 2011 13” MacBook Air I/O cable I’m surprised the onboard diagnostics didn’t fire off an error. Clearly your system is running in Safe Mode this is when the CPU’s clocking is dropped to prevent it from overheating. If you open up Activity Monitor you’ll see the kernel_task is running hard If kernel_task is using a large percentage of your Mac CPU as SMC is expecting a sensor input. In this case the input is present but telling SMC the part is over heating. Either the iSight camera (cable) or the I/O board is causing this.
