defect with blender

542/5000 guys I'm new here, I hope I'm not taking the doubts in the wrong place but I'm having a huge problem here, in blender 2.8 my 3D viewport is all black it doesn't appear anything else, only in the texture visualization mode I use a 9800gt 1Gb graphics card, there is I already searched the internet like crazy but I didn't find the solution another problem I'm having and with a texture I made on Captain America's shield that I modeled, it gave an open error and bugged every texture, how do I solve these problems? NOTE: I was unable to add the two screen captures.