SOLVED Everything looks pixelated after switching GPU's!!!

Hey guys! The cooling fan on my GeForce 210 died yesterday, so I had to switch to the Radeon 3000 motherboard GPU. That GPU is even weaker that the G210, so when I switched to the 3000 the text and anything displayed was pixelated! I expected this because this was happening many times when I was switching GPU's! Today I bought a new fan, attached it to the G210, connected the GPU with a cable, and guess what!!! Everything is still pixelated! I went to the Screen Resolution window and it was detecting two monitors. Whichever I switched to, nothing changed! My monitor's screen resolution is 1366x768. The default resolution set in this windows was 2K i think (1440p). I lowered it to 768p and nothing changed! Everything remained the same!!! I lowered it even more, and then everything became bigger and even more pixelated!!! I switched to 768p again and started looking for solutions!!! I uninstalled everything regarding Nvidia and AMD/ATI from my PC, cleaned everything using WiseCare 365 restarted and normally everything went like when you install windows. I checked the Screen Resolution window before reinstalling drivers, and the two minitors thing was fixed! Only one monitor was shown in there! I went to the NVIDIA website and downloaded GeForce Experience, downloaded the latest driver, and the resolution fixed itself, everything is normal but still everything is pixelated!

The letters are not displayed correctly...
You can see the pixelation in these pictures:
https://scontent-b-ams.xx.fbcdn.net...919_612479798873354_3012603835390729549_n.jpg
https://scontent-b-ams.xx.fbcdn.net...=fdae257e98f9f09e2aa352e587d0a0d1&oe=5480F66B
https://scontent-a-ams.xx.fbcdn.net...=13422b9387805e91a1da9452efc62805&oe=546BB8DF

The displayed content starts above the end of the screen like in this next picture:
https://scontent-b-ams.xx.fbcdn.net...594_612479665540034_1568027829356560215_n.jpg

and the displayed content goes above the other end of the screen as shown in the next pictures:
https://fbcdn-sphotos-b-a.akamaihd....7149_612479818873352_442173198429927958_n.jpg
https://fbcdn-sphotos-a-a.akamaihd...._=1416624052_b26dca98703b3502ac06a72b1958cc26

I don't know what to do! I was planning to sell this PC and buy a new one but until I save up enough money to buy the parts i want I have to use this one, but I can't use it if it's like this! It drives me nuts!!! Does anyone know what causes this problem???

Use driver cleaner to uninstall the old drivers, then reboot. Install new drivers then reboot.

Check here .

Have you tried doing an auto-configure on your monitor's settings?

ATMISIDE you are a life saver!!! Thank you very much. Damn!!! The solution was so simple... I just pressed the auto button on my monitor and everything was fixed!!! Thank's man!!! I appreciate this. I don't know what the thanks button does but I'm gonna press it anyways!!!

Nebulous Thanks for your answer but ATMINSIDE's advice helped me!!! Thanks anyways!!!

Roger that! Glad you got it sorted out