I'm running windows 10 Home version 1903 build 1836.329. When I click on the search icon on the task bar I get a white line with the search icon "Type here to search" and above the white line is an all black rectangle. Typing into the line shows up but does
nothing. Here's a screen shot of the corner of the desktop.

I've tried all(i think) of the fixes I've seen in this thread:
- The one involving $Manifest
- Ctfmon
- stopping and starting Cortana in taskmanager
- sfc /scannow
- dism ....cleanup
- running the search trouble shooter
So far nothing has changed, it's as if whatever is supposed to be supporting the search icon isn't there. I have two other windows 10 PC's in the house and the search icon works fine, with a header line, top apps, and recent activities all there before I
type in anything.
I'd appreciate any suggestions.
I forgot to mention, Search has worked fine for me in the past on this PC. I can't be sure, but I think I lost it in the last month. The only updates that went on in that time were KB4511555, KB4512941, KB4512508, and KB4505903, with the first listed being
the last one that went on.
A post by FnPHolland said the same problem had been fixed
by removing KB4512941, I tried that and Search now works again.
I hope Microsoft will do something to fix this.
-------------update 2019-09-08-----------------------
Ok, I looked up KB4512941 on Microsoft support. Buried in the bowels of the write up is the following:
"Microsoft is getting reports that a small number of users may not receive results when using Windows Desktop Search and may see high CPU usage from
SearchUI.exe. This issue only occurs on devices that have disabled searching the web using Windows Desktop Search."
And a statement that they hoped to have a solution by mid-September.
So it looks like I turned off the web results some time back. No longer seems to be easy to turn back on. I looked on TENFORUMS.COM and found a little downloadable .reg file Turn_On_Search_web_results.reg, I ran this
then allowed windows to look for updates. It put KB4512941 back on.
My Desktop search now works.