Hi I need help to identify why my iMac stand is making squeaky noise?

You’ll need to decide if the squeak is worth the effort to fix! In the 2011 and older models I had ways to get to the hinge without opening the system. The 2012 models forward prevents that pathway, now you need to open the system up and remove the logic board to get to the hinge area.

The Blue pivot area and the Purple tension spring areas can benefit with some WD40. I spray into the cap to create a puddle which I can then dip a cotton swab into and wipe the parts area with the damp swab. You don’t what to spray directly in as you don’t want the oil going onto the logic board or fan!

Here’s the guide you’ll need to follow: iMac Intel 21.5" EMC 2544 のロジックボードの交換

Now a big warning! The newer 2012 onward ‘Thin Series’ require a bit more care as you can damage the display taking it off. First make sure you review the guide a few times as a common cause of damage to the display is digging in too deep with the tools as well as prying! Use the iMac Opening Wheel cutter tool making sure not to go to deep and I like using the Plastic Cards Don’t forget to get the needed adhesive strips as well.