so ive got a similar problem nut the worst thing is that i locked my computer for 3 days and right before the 3 days was up, i went to the store for 20 minutes before i left everything was fine, it all worked perfectly but i came back, moved and clicked my mouse to turn on the screen, all the rgb lights went on, but the screen was black. i restarted my mac about 25 times and nothing, i reset the SMC NVRAM and PRAM all atleast 3 times and nothing worked, the model is a 2007 iMac High Sierra
+
so ive got a similar problem but the worst thing is that i locked my computer for 3 days and right before the 3 days was up, i went to the store for 20 minutes before i left everything was fine, it all worked perfectly but i came back, moved and clicked my mouse to turn on the screen, all the rgb lights went on, but the screen was black. i restarted my mac about 25 times and nothing, i reset the SMC NVRAM and PRAM all atleast 3 times and nothing worked, the model is a 2007 iMac High Sierra
so ive got a similar problem nut the worst thing is that i locked my computer for 3 days and right before the 3 days was up, i went to the store for 20 minutes before i left everything was fine, it all worked perfectly but i came back, moved and clicked my mouse to turn on the screen, all the rgb lights went on, but the screen was black. i restarted my mac about 25 times and nothing, i reset the SMC NVRAM and PRAM all atleast 3 times and nothing worked, the model is a 2007 iMac High Sierra