I´ve been working on this model for some time now, i added some materials and added light, it had been working just fine , until i loaded the project today and my model is now like this...
Thanks for the attention. 
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1Are you using a GPU by AMD? Check this post: amd-gpu-material-in-material-preview-mode-and-rendered-mode-is-entirely-gray – susu Jan 20 '21 at 18:28