You have two distinct problems with your iMac that you’re unfortunately conflating with the most obvious damage - the broken display.
The display is most likely broken and will need to be replaced. I can be tested, but not in a typical home or office environment.
The cable connectors on the logic board may be damaged as a fall like that will literally ...
It sounds like you've somehow installed a MacOS installer disk onto your internal drive. Then you're booting up to that, and trying to install the OS over itself, or trying to partition the volume of the running system.
Boot to Recovery (Command R at restart) and wipe the disk from there. Then install the OS.
The usual result of removing the thermal sensor is roaring fans; I suspect that there's little reason for Apple to add some "if no drive, ignore sensor" logic, because Apple would want to replace the drive.
The best instructions for replacing components on your Mac can be found here:
Remember that your iMac ...
If it never gets moved around, you could actually just leave it loose inside the casing.
It won't make any practical difference, you just don't want to be shaking it around unnecessarily.
I wouldn't think of doing it in a laptop, but a desktop it will be fine.
I had an SSD hanging loose inside the optical bay of a Mac Pro for about 5 years with no ill-...
That model does not support SSD and HDD in addition to the optical
The 27” from 2010 does, however. It just needs a mounting bracket and the SSD. It’s SATA 3 Gbps bus and this link has lots of upgrade referrals:
This association is purely optional. You don't need an AppleID or an iCloud to manage your Mac and as long as you're the original purchaser and have proof of purchase, you can lock the firmware, iCloud Activation Lock and take your Mac to Apple and they will unlock it for you.
The only reason to put your admin account into iCloud is if you want to let that ...
For 6K to work, you need one of the following:
A GPU that supports one DisplayPort 1.4 connection at HBR2 speed using Display Stream Compression (DSC). The signal can be sent directly using USB-C, or as Thunderbolt.
A GPU that supports two DisplayPort 1.4 connections at HBR3 speed without DSC. The GPU needs to be connected to a Titan Ridge Thunderbolt ...
This Apple document tells you everything you need to know about Firmware passwords.
The essential points for you are:
Your Mac asks for the firmware password only when attempting to start up from a storage device other than the one selected in Startup Disk preferences, or when starting up from macOS Recovery.
If you can't remember your firmware password or ...