iMac graphical glitch when restarting

[Ztormie]

I shot a short video of this since it was easier than trying to describe it. It started happening recently but since I don't restart my iMac very often I don't know excaclty when. Besides that the computer seems normal, is it something to be worried about or might it dissapear with some future software update?

http://www.youtube.com/watch?v=DZ3YcH3lm_U&list=UUyY1dayEwjTzp0yKNj-411Q&index=1

 

[FreemanW]

Oh my.

That does not look good.

But . . . this is only when you Restart, not a cold boot? Curious.

Does it happen every time or only occasionally? Only Restart or Start up from Off state?

These are some questions that I would imagine Apple will ask.

I would initiate a ticket with AppleCare support, include the video for their consumption. I would guess "faulty" GPU section diagnosis and unit replacement is in your future.

Sorry.

 

[Ztormie]

Don't have Apple Care, this is a late 2010 iMac and I didn't purchase any besides the first free year.

I tried a cold boot just now and it happend then as well, when I restarted in Windows it didn't occur though, weird.

Might a OS-reinstall help with anything? As I said, the computer works fine apart from this, no weird graphics or anything so I might just have to live with it :/

 

[FreemanW]

Don't have Apple Care, this is a late 2010 iMac and I didn't purchase any besides the first free year.

I tried a cold boot just now and it happend then as well, when I restarted in Windows it didn't occur though, weird.

Might a OS-reinstall help with anything? As I said, the computer works fine apart from this, no weird graphics or anything so I might just have to live with it :/

Oh, it is not new. /$h!+burgers

Uh, yeah, I was tempted to mention that diagnosis might very well include Apple wanting to reinstall the OS.

Yeah, if you've all your data and software dusks in a row, you could try that and see if it provides resolution joy.

Good luck!

/in honor of Ray Lewis being in another Superbowl, I'll take a stab at the culprit being a bad IC board that is in the early stages of failure.

 

[WilliamG]

I'd do a reinstall to rule that out, but also reset the SMC/PRAM first maybe.

 

[Ztormie]

I'll try that, thanks.

 

[Ztormie]

I reset the PRAM and it worked! No more glitching Thanks so much for your advice guys!

 

[WilliamG]

I reset the PRAM and it worked! No more glitching Thanks so much for your advice guys!

Glad that fixed it!

 

[FreemanW]

I reset the PRAM and it worked! No more glitching Thanks so much for your advice guys!

Very cool indeed!!

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While I realize that this question derails the thread . . . .

I'm new to Mac, what exactly is SMC/PRAM?

It sounds as though SMC is analogous to the BIOS on a PC?

. . . . and PRAM is analogous to the CMOS on a PC?