Hello guys I got 2 issues with my iMac i5 ... I'm starting to be very disappointing ... 
So here we go with the 1st one
I got this " Stain" on my screen I really don't know what it is , I try to clean under the glass but it's like under or in the screen
The second one starting to happen couple days ago it's green and purple square on my screen
Can somebody help me and tell me what is going on with my computer ?
So here we go with the 1st one
I got this " Stain" on my screen I really don't know what it is , I try to clean under the glass but it's like under or in the screen

The second one starting to happen couple days ago it's green and purple square on my screen

Can somebody help me and tell me what is going on with my computer ?