I am stumped I do not understand why my roommates macbook pro when duel screened will display perfectly on my monitor while mine refuses to, but mine will display perfectly when using another monitor that is not mine. Please help me out.

One day when using my duel display the second monitor decided it wouldn't display at full resolution in the middle of doing something i was confused. I use a mini display to hdmi then hdmi to the second monitor. I thought maybe the converter or cable died. I bought another another mini display to hdmi and tried another hdmi cord and the same issue. My roommate has macbook pro as well so i decided to see if it was the monitor, when i pluged the mini display converter into his and used the external monitor it displayed perfectly not below resolution. Doing this I knew it was not the monitor or the mini display to hdmi or the hdmi cable. I took it into the genuis bar assuming now that it was my grapics card or logic board. When the genuis went to duel screen it on a cinema display it displayed perfectly. So went home tried to duel screen it again and still not displaying at full resolution. That is where I am stuck, in summary:
My screen used to display perfect resolution on a second monitor and suddenly did not.
Tested two mini display to hdmi and hdmi cords both were fine.
Tested to see if monitor was issue but displayed perfectly when i used roommates laptop.
Went to genius bar and displayed perfectly on second monitor so it can display perfect resolution on apples monitors but will not do so anymore on my monitor, even though roommates macbook pro will display perfect resolution on my monitor.
I am beyond confused.

Apparently you have tried everything except - take the monitor in question to the Apple Store along with your computer.  If it works there, the mystery continues.

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