Please post a screen capture.
What is your exact version of LR and your OS?
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A couple of possibilities come to mind-
1. The Preview cache has become corrupted.
2. Windows possibly changed the Graphics drivers or the Monitor Profile.
Try changing the monitor profile- Photos appear as black, gray, or blank rectangles in Lightroom
Read the section: Solution 2: Associate sRGB IEC61966-2.1 Color profile on your system
and check you have the best drivers for your Graphics card.
Thank you so much. have tried no 2 but didn't work so now going to try no 1!!!
Not one of the solutions is working
Some more information from you may help-
What version number of Lightroom? OS?
Have you actually tried deleting the... [Catalog-name] Previews.lrdata ... entire folder?
What Graphics Card?
What option are you using in the Preferences/Performance Tab, [Use Graphics Processor] ?
I have 'Windows 10, I tried to use Graphic acceleration als tried without Graphic acceleration. I
Here is my Machine info:
Lightroom Classic version: 7.0 [ 1140024 ]
License: Creative Cloud
Operating system: Windows 10
Application architecture: x64
System architecture: x64
Logical processor count: 8
Processor speed: 1.9 GHz
Built-in memory: 16331.8 MB
Real memory available to Lightroom: 16331.8 MB
Real memory used by Lightroom: 448.4 MB (2.7%)
Virtual memory used by Lightroom: 569.5 MB
GDI objects count: 529
USER objects count: 1806
Process handles count: 3330
Memory cache size: 36.5MB
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX
Camera Raw virtual memory: 49MB / 8165MB (0%)
Camera Raw real memory: 51MB / 16331MB (0%)
System DPI setting: 96 DPI
Desktop composition enabled: Yes
Displays: 1) 1600x900
Input types: Multitouch: No, Integrated touch: No, Integrated pen: No, External touch: No, External pen: No, Keyboard: No
Graphics Processor Info:
OpenGL: AMD Radeon HD 6700M Series
Check OpenGL support: Passed
Vendor: ATI Technologies Inc.
Version: 3.3.13417 Core Profile Context 15.301.1901.0
Renderer: AMD Radeon HD 6700M Series
Total Video Memory: 1009 MB
Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic CC
Library Path: C:\Users\hp\Pictures\Lightroom\Lightroom Catalog.lrcat
Settings Folder: C:\Users\hp\AppData\Roaming\Adobe\Lightroom
2) Canon Tether Plugin
3) Export to Photomatix Pro
6) Nikon Tether Plugin
Config.lua flags: None
Adapter #1: Vendor : 8086
I also deleted the [Catalog-name] Previews.lrdata ... entire folder?