:::weird white screen plus staircase colored flickering dots??:::

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whats up everyone. this is my first post here on mac forums. I have this issue with my 4 year old 17inch imac. I tried doing some research on the issue but i cant find my specific one. When i turn on the comp i just had a white screen. Then after some recommendations i reseted the memory by doing command option RP. Then these staircase colored flashing dots started happening but in the background i see the OS booting up. Once it finishes booting up i have a white screen and I cant see anything other than a white backdrop and the staircase colored lines.

here is a picture for reference: I really appreciate any advise!!
this picture is of the computer already "loaded."

photofz.jpg
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Uploaded with ImageShack.us[/IMG]
TIA,
Gabe.
 

chscag

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Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
It looks like a graphics processor problem. Try attaching an external monitor to your iMac and see if the same thing happens. If you don't have a spare monitor, a TV can be used. Post back the results and we can go from there.
 
OP
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i think im going to have to buy the monitor adapter because i dont think the computer came with it. :/
 

robduckyworth


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Your Mac's Specs
15" MBP, 2.5GHz i7, 750GB, 6770M 1GB, iPad 3, iPhone 4, custom PC
that is a tell tale sign of a broken graphics processor, as chscag says.
 

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