Model does not show its lines first the lines were temporary visible with draft analyses but with the second try it did not work. I have tried restarting solidworks but the lines remain invisible with other parts there is no problem, display state does not work too with this part.
Here is the part.
Hi Kader,
The first problem I see in this part is that is that there is no actual shading to the shaded faces; they are all the same flat color. This is because there is only an ambient light source turned on in this part and no directional lights. To access the lights, see this help topic. You will see once you get to the Lights folder that you have 5 lights (1 ambient, 4 directional), but all of the directional lights are turned off. And if you turn on one or more of the directional lights, you will see the detail of the part now, but it is quite washed out because the ambient light is turned up quite higher than default. So edit the ambient light and turn it down. I see also that three of the directional light names are 24, 25, 26. Were you adding and deleting directional light sources when trying to troubleshoot this? Otherwise, have you run some sort of macros or add-in programs that were manipulating the display?
Now, for the reason the shaded edges are not showing: The first thing I did to troubleshoot this was try to change the over all Display Style for the part from the heads up view toolbar. Nothing changes when I choose the other styles and this usually means that there is an override on the individual bodies. To check that, I expanded the Solid Bodies folder in the FeatureManager tree and expanded the display pane so I could see the display information of all of the individual bodies. Usually, in cases like this, the Display Mode column would show with the Shaded icon for each body, but it instead is showing Default Display icon for all the bodies. I have no idea how it got into this state where the icon does not properly reflect the state. But to fix it, select the first body in the bodies folder and then shift select the last body (to select them all). Then on the right mouse button context menu, choose Body Display->Wireframe (really you can choose any of them except for Default Display since the goal is to switch to any other display mode and then back to Default Display). Then go back to the same menu and choose Body Display->Default Display. Your edges should be back and now the display of the model should properly follow the Display Style button in the heads up view toolbar.
Again, I have no idea how the bodies got in this state where the display mode in the display pane does not reflect the actual display mode of the bodies. Again, have you been running any sort of macros or add-ins that may be manipulating the display of the model?
I hope this helps,
Jim
Welcome to the forum. Can you post the Part here (see https://forum.solidworks.com/community/faqs/blog/2017/12/24/how-can-i-attach-a-file-to-a-forum-post)?