-Which model 2017 iMac - 21.5 or 27-inch, Retina or not?
I think it's the iMac (Retina 5K, 27-inch, 2017) - Technical Specifications:
support.apple.com
Hardware Overview:
Model Name: iMac
Model Identifier: iMac18,3
Processor Name: Quad-Core Intel Core i5
Processor Speed: 3.4 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 6 MB
Memory: 16 GB
Boot ROM Version: 428.0.0.0.0
SMC Version (system): 2.41f2
-What type of drive is in the iMac - 1 TB (5400-rpm SATA), 1 TB Fusion Drive, or 1 TB flash?
I think it has the stock 1 TB Fusion Drive, but that's just a guess based on the fact that it has previous users on it going back to 2017, and on what I've read about the Mac.
APPLE HDD ST1000DM003:
Capacity: 1 TB (1,000,204,886,016 bytes)
Model: APPLE HDD ST1000DM003
Revision: AQ04
Serial Number: Z4YF2WJR
Native Command Queuing: Yes
Queue Depth: 32
Removable Media: No
Detachable Drive: No
BSD Name: disk1
Rotational Rate: 7200
Medium Type: Rotational
Partition Map Type: GPT (GUID Partition Table)
S.M.A.R.T. status: Verified
-Are you getting any errors/kernel panics?
Yes. When any errors popped up, they say something about a kernel panic with WindowServer, or keychain, or an app tried to access something outside of security restriction (I think it's tied to some Gatekeeper issue after my Catalina update, but I couldn't find a virus with CleanMyMac X trial).
Specifically when it happens, the bottom Dock will go black, things will freeze (except for the mouse pointer), then the screen will go black but I can still use the mouse pointer... and then it'll just sit there until I hold down the power button to force shut it off. I've gone through Safe Boot (cache clear), parm cache reset x3, Recovery options (however, my Time Machine stopped saving to the USB drive, and now Recovery is saying that Catalina is saving "snapshots" to Macintosh HD... which apparently is a Catalina feature since update but it just looks like a mess to me now).
I'm afraid of losing things I need that would be unrecoverable in some app if I try to reinstall the OS (I'm new to this on Mac but not Windows).
I found some info in Finder > Macintosh HD > Applications > Utilities > Console.app > Crash Reports:
I'm having trouble uploading the screenshots of the other ones:
Termination Reason: WATCHDOG, [0x1] monitoring timed out for service
Termination Details: WATCHDOG, checkin with service: WindowServer returned not alive with context:
is_alive_func returned unhealthy : WindowServer initialization not complete (post IOKitWaitQuiet)
80 seconds since last successful checkin, 2729 total successsful checkins since load, 39 seconds since last crashed by watchdogd, (1 induced crashes)
I think the Chrome fail is due to the kernel fail. I'm not seeing any rhyme or reason for the crashes other than "WindowServer", however that works.
-Which applications are open when the issue occurs?
Chrome this time... but others previously. I use Chrome the most, but I'm a web developer so I use a lot of apps related to that too.
-Do you have any third-party utilities like MacKeeper or antivirus installed?
Sure, but I'm not familiar with the ones installed before me. Everything was fine until a few weeks ago, and I didn't install anything new recently. I uninstalled a bunch of apps by trashing them from the Mac and my User Applications folders, and also through CleanMyMac (which was recommended to me by coworkers and my boss).
I have four pages of apps, I use maybe one page's worth of them, and I guess I could try uninstalling the rest, but the problem appears to be kernel panics from WindowServer or a hard drive issue, and I'm finding no real indication of a hard drive issue after running diagnostics.
You can check the logs using the Console application, which is in the Utilities folder.
Thanks, see above.