the blocks crashing

after putting 2 mods on minecraft, I started to see badly the blocks, which changed color, precisely from the original to black and all like that, then the floor that has strange stripes and so with all the blocks,here so, the blocks are seen quite badly and also those in the inventory and on the item frames. i have already tried to look for my problem but nobody has it. I tried on another world but it's the same, I uninstalled the mods but nothing stays like that, I uninstalled minecraft a lot of times but nothing stays the same, I don't know what to do, even the fps dropped drastically before they did me the 300 now the 70.