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Original post by: Thierry de Coulon ,

Title:

Reboot and freezes when using USB / Wifi

Text:

Hi. I got a second hand iMac. The machine boots OK, i could install systems (tried 10.11 and 10.13). The Mac works correctly (seems), as long as I don’t use a USB scanner or try to access the internet.

When I do, I get all sorts of weird things: black screen and reboot (also happens some time when just using software), grey screen (most often), blue screen (once), other screen colors - in any case it freezes and will only boot again after resetting the PRAM (several "sound + reboot” for about 20 seconds). Replacing RAM did not help.

I have to decide if I try some repair or break the machine into spare parts. I think it’s a board problem, but which board?

Device:

iMac Intel 27" EMC 2429

Status:

open