My MBP won't boot, with horizontal line at apple logo

"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."

"Hi,

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"

"The 2011 15inch has bad GPU/South bridge issues. Apple warranties these items free of charge.

Contact apple or go to your nearest authorized dealer. Tell them you have been having artifacts on the screen and lines.

That it has started showing a pink hue and no longer boots.

You should be able to have it fixed for free."