Hey, I was wondering if anyone else has had similar issues and if it's a hardware issue. I have a less than a week old rMB base model, space grey. I'm running El Capitan Public Beta 4, which I have been on the public betas the day I got my MacBook. Has been running great, no issues other than the occasional crash. But the past 2 days I've been getting system lockups, but only occasionally. Sometimes it's a full freeze (can't do anything, trackpad has no feedback, have to hold the power button until it turns off) or a black screen with some red lines (attached a pic). Today is when it started getting bad, now it's unusable. I'm lucky if I get a minute past the login screen, it's even happened before the apple logo (black screen with red lines.). Can't use internet recovery to make sure it's not the beta since it does the same black screen eith red lines thing. I even have trouble getting it to boot back up, totally unresponsive to anything, have to hold the power button a few times to get the chime. I reset SMC and NVRAM as well. I'm almost convinced it's a hardware issue, seems to me like a GPU failing. But just wanted to see if anyone has had an issue like this before I head to the store tomorrow, thanks!