First White and then Black Screen after SMC and PRAM reset.
I have this very strange problem with my otherwise greatly working macbook pro 13".
Recently I saw that the time wasn't updating after waking it from sleep unless I don't click on Date & Time Preferences and then it updates from the internet.
So, I decided to reset the PRAM and SMC, I did both and booted up perfectly. That night I put it to sleep and in the morning I was happy seeing the time updating in a second after waking it from sleep.
But my happiness didn't last long. After a few more sleep and wake ups I got this solid white screen with nothing else, no chime no boot. I decided to do another SMC reset, because something might have gone wrong with it the first time. And then BAM! - no white screen anymore, instead I have black screen and the same symptoms. No Boot, No Chime, No HDD reading. Everything seems to work - Fans, Hard Drive spinning. Lamp is glowing in front but no boot.
I read everything about such problems in the net and tried all of the tips.
Battery removal, RAM removal, HDD removal, Holding power button for 5/10/20sec with or without charger/battery, whatever. Reseted the SMC like 20 times.
For the record - the PRAM cannot be reseted anymore when having white or black screen only as it doesn't chime or even start booting.
And just when I was about to give up, It booted up. I used it for almost a week without any problem and after one waking from sleep I got the white screen again.
Since then i've been trying everything for 2 days but the only thing that I got is bricking it to black screen again.
I have some experience with macs so I changed the thermal paste of the CPU and GPU. Also cleaned everything from dust and corrosion just in case.
I was about to give up on it and started thinking of buying a new one but then suddenly the white screen came again, after doing the following procedure:
- Unplug laptop from charger
- Hold PWR button for 10 seconds
- While still holding the PWR button, plug in charger and KEEP HOLDING PWR button
But the white screen is no better than the black except that I see the display is working.
Then tried to reset the PRAM powering it on with Alt + Cmd + P + R and no more white screen again. Pitch Black again.
I know the mac is not dead because I bricked it that way. Just want to share the problem if anyone has met this anomaly too.
Is this a good question?