2011 MacBook Pro won't boot after High Sierra update

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This past week I bought a 17" MacBook Pro off eBay. Reputable seller. 1tb SSD, 16gb ram, running High Sierra.

I received the laptop yesterday and started it up. Booted right up, no problems. I connected a few of my accounts and changed the admin password and then closed it for the night, leaving it plugged in.

This morning I opened it up and installed the Arduino ide and chrome. The laptop informed me it had updates to install, so I let it do that. It took a little while, half an hour or so.

Once it was fine and restarted, I opened chrome to look out some info for the Arduino script I was planning on working on. After 10-15 minutes, the entire screen turned blue with vertical lines and froze. It turned it off, waited a few seconds and turned it back on.

It booted the the apple loading screen. The loading Bay gets to 1/4-3/4 of the way and the screen either goes blank (not off though) or white. Rebooting gets the same result.

So far I've tried:
Booting into safe mode (takes longer for the loading bar to load, but nothing different)
Booting into recovery mode (same thing - still good to the apple loading screen, still white screens)
Resetting SMC
Resetting NVRAM
Internet recovery mode (asks me to select a wireless network and enter my password). Gotta to the apple loading screen.
Booting into single user mode - did fine, I get to root prompt. Ran fsck, found no issues.
Booting into diagnostics (get an error that it can't be run)
Booting into internet diagnostics - tried running the expanded test and the laptop died (battery) because I didn't realize there magsafe adapter wasn't charging.

I've already contacted the seller and he told me he can't troubleshoot remotely, but that I can ship it back and he'll refund my money. But I want this laptop. I'm a little gun-shy now about ordering another used MacBook off eBay. And this laptop seemed to work just fine until the os updated.

Is there anything else I should try before I give up on it and send it back?
 

chscag

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2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
I've already contacted the seller and he told me he can't troubleshoot remotely, but that I can ship it back and he'll refund my money. But I want this laptop. I'm a little gun-shy now about ordering another used MacBook off eBay. And this laptop seemed to work just fine until the os updated.

Is there anything else I should try before I give up on it and send it back?

Welcome to our forums!

Send it back and get a refund. That's the classic symptom of a bad GPU which a great many of the 17" MacBook Pros have been prone to. There really is no permanent repair for it even when replacing the logic board since it will fail again. For several years Apple had a free recall on those models and would replace the logic board without cost. But that recall program is long over. Send the machine back, get a refund, and buy something newer.

Sorry for the bad news.
 

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