"Connect to an external monitor. If you see the same lines on that screen it points to a VGU/VGC (logic board) problem. The heat and fans lead me to think this may be what's going on but best to connect to an external monitor to confirm or deny that supposition.
If the external screen looks normal it would point to an internal video chain problem. Run AHT test 2 or 3 times to see what problems it finds. Record any error messages it reports - come back here with them.
If this Answer is helpful please remember to return and mark it Accepted."
I've just been through the same mess, details description of issue is as follow:
Red horizontal lines display right after you startup, it will go on to show you the apple (still in red horizontal lines), then it show the gray screen, and your fans start running like crazy.
If you switch to Windows OS you'll be able to run on safe-mode, and the screen look like... well you know
My conclusion is the RAM, not normal issue, a special RAM issue. I followed these steps and fixed it:
Take out one RAM
Reboot on recovery mode, (press and hold: command + R)Then it will display a crappy screen again still the apple signThen it will turn blue.
Don't panic, shut it down this time do a PRAM reset (press and hole command + option + P + R)
If the RAM you are using is ok, everything should back to normal. If not, then replace it with the one you just took out and do the whole thing again.
I tried command + R alone, and it not work. I then tried PRAM reset (press and hole command + option + P + R) alone, it did not work. Only when I combined them, then it worked!
Also, it you put the faulty RAM in and take it out, even though you are sure the RAM is OK, the problem still exist without doing the process that I just described
Hope this helps, and stop paying Apple for non-sense things.
P/S: I keep wondering why all MacBook's suddenly have the same issue at the similar period. If Apple do this on purpose to make us purchase new stuff?"
"I had the same problem on my early 2011 15"" Macbook Pro
I solved it by resetting the SMC
Reset the System Management Controller to Fix the Striped Display on Boot
This will dump and reset settings for anything power management related, and is long known to resolve problems with things like fans, heat, sleeping problems, and of course, display issues.
On any modern MacBook Pro or MacBook Air with a built-in battery, which is just a bout all of them nowadays, this is how you do that:
Shut down the Mac and connect it to your MagSafe adapter and a wall outlet as usual
Hold down the Shift+Control+Option+Power button at the same time for a few seconds
Release all keys at the same time, then boot the Mac as usual"
"After receiving the new battery the issue persists. Then i found this link https://www.apple.com/support/macbookpro..., apparently there is a known video issue for 15-inch and 17-inch MacBook Pro models manufactured in 2011 and 15-inch MacBook Pro with Retina models manufactured from Mid 2012 to Early 2013.
You can check in the link if your macbook is under the repair extension program and they would fix it for free. Mine does.
"Hi I know I'm a little late to the party, but I had this problem, found this thread, and ultimately solved my issue. The root cause for me was a POS (Piece of ...) Radeon display controller. Google ""radeongate.""
Late 2011 MBP. 15"". I took it to the Apple store. They ran a diagnostic. Told me that my video chip was dead and I needed to a new system control board. ""Unfortunately, we no longer carry those..."" Ebay: $450. Screw that.
I was just about to bake my system control board in the oven when I did a verbose boot and googled some of the messages I saw. I ended up finding realmacmods. This process worked for me when all the PMC PRAM etc wouldn't. https://realmacmods.com/macbook-2011-rad...
At the bottom of that link is a permanent (disconnect a component from the board) solution that I may do if upgrades start failing.
