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I have an early 2010 iMac 27" with the Graphics Update and I don't have the overscan slider bar, just the button like always.
 
I have everything Software Update will let me install. :)

I don't know then. I'm on the newest update and it has it when u go to displays in system preferences. Maybe your just not looking at the right window it only shows up on the window that opens on the tv and let's you change the resolution
 
I've checked the window on my tv.

It might very well be specific to OS X 10.6.4 shipped with the latest iMacs just as it was originally only shipped with the latest Mac Mini. Hopefully Apple will make it an update for other machines or it will be part of OS X 10.6.5.
 
Sorry to dredge up a dead topic but, I have a macbook air hooked up to my Samsung TV through a Mini-DVI to HDMI. I choose to mirror the displays, but the underscan option becomes grayed out! Any solutions?
 
Unusual Solution!

I was directed to this thread from:
https://discussions.apple.com/thread/2440689?start=15&tstart=0
where they do not look kindly on criticism of the mother ship.

Here it is 3 years later, and this bug still has not been fixed in OSX 10.6.8!!! It is clearly just an everyday software bug that the Overly Entitled Applegencia will not fix. The way you can tell it is a definite bug is that if you use the display system preference to rotate the mirrored display by 90º, 180º, or 270º, the "underscan slider" becomes ungrayed-out, and you can use it!

My unique solution to this Apple botch job is to simply mount my big flat-screen TV monitor upside down, us the display system preference to rotate the slaved display by 180º, and use the underscan slider to set the picture so the menu bar is visible. Oddly, the menu bar is perfectly visible BY DEFAULT in all rotation configurations EXCEPT right-side-up!

C'mon, Apple, what happened to you??? Can't you fix a hard-coded, repeatable, unwork-around-able error IN 3 YEARS??? Sheesh!!!
 
I was directed to this thread from:
https://discussions.apple.com/thread/2440689?start=15&tstart=0
where they do not look kindly on criticism of the mother ship.

Here it is 3 years later, and this bug still has not been fixed in OSX 10.6.8!!!

Go figure. That was 3 operating system versions ago. You are expected to upgrade your OS once in a blue moon. I'm not saying that's fair and I think it's kind of ridiculous in some respects, but that's just the way it is with Apple. They've moved on...three years ago. Snow Leopard "upgrades" were stopped three years ago. They only do the occasional security fix now. That's it. That's all there will ever be since it's not longer supported. I mean I realize Lion sucked (I skipped it), but Mountain Lion 10.8.5 was rock solid and ran like a champ on my 2008 MBP and my 2012 Mac Mini. Besides, now that Mavericks is FREE, there's no excuse to not upgrade short of your Mac not being supported or you have massive amounts of PPC software that are not replaceable with Intel versions. Mavericks feels just as fast as Snow Leopard on my 2008 Macbook Pro and pretty darn stable for version 1.0 of it. The multi-monitor improvements in Mavericks alone are worth the upgrade, IMO. I can finally use full screen mode on my second monitor without screwing up m primary display and vice versa.

C'mon, Apple, what happened to you??? Can't you fix a hard-coded, repeatable, unwork-around-able error IN 3 YEARS??? Sheesh!!!

They did fix it. They fixed it in newer versions of the OS (i.e. my secondary display is an HDTV and overscan adjustments worked perfect in both Mountain Lion and Mavericks for it). Time to upgrade to the present day. Frankly, Mavericks is pretty slick for redirecting video output. I can AirPlay my Mac Mini's primary display to my AppleTV in the living room and play games in the living room using a Bluetooth Playstation 3 gamepad (yeah it has that kind of range). I assume Bluetooth mice and keyboards would let me use the living room as an Internet station as well, etc. If I had a newer Macbook Pro, I could use Logic in the living room and mirror the display without a cable to the same TV for editing. The iPad can be used to adjust mixing controls without touching the primary computer. You can't do any of that stuff in Snow Leopard. Wake on Internet activity finally works right in Mavericks too for that matter. My Mac Mini can even get email, etc. while sleeping and wakes instantly if my AppleTV running XBMC wants to access a media archive. I've got full USB3 support on my 2008 Macbook Pro with an express card that only cost me $12 shipped (not supported under Snow Leopard either). Yeah, I have no love for Snow Leopard these days. I was worried when I saw Lion was such a POS, but thankfully Mountain Lion fixed all that. Mavericks needs a few tweaks, but it's still pretty darn stable here on both my machines, especially for version 1.0 of it.
 
Now I think you're telling me something of fundamental importance:

I have assiduously applied every upgrade suggested by ">Software Update.." (except for iTunes) since purchasing this Macbook Pro 2 years ago. But all it suggests it is possible to upgrade to is 10.6.8. I have been cursing Apple for offering an extended maintenance contract which lasts longer than they continued to create new compatible software for this machine. Apparently we are supposed to ignore the automatic software update feature and do something else? Update OS's by hand? What gives? What is the point of automatic update if it serves only as a red herring to dissuade those of us in the field from updating manually???

Now that I've been tipped-off, I'll google the issue, but what a surprising twist of events! Thanks for taking the time to criticize my out-of-date OS, or I would never have known my MBP may be compatible with unadvertised newer S/W!
 
Now I think you're telling me something of fundamental importance:

I have assiduously applied every upgrade suggested by ">Software Update.." (except for iTunes) since purchasing this Macbook Pro 2 years ago. But all it suggests it is possible to upgrade to is 10.6.8.

You pretty much need 10.6.8 installed in order to upgrade through the App Store to newer versions of OSX (in prior times that meant Lion and Mountain Lion, but now Mavericks). Thus, you may need to let it update to 10.6.8 first and then select to upgrade to Mavericks.

But yeah, your 2 year old machine will definitely run Mavericks. My 2008 model runs it just fine.
 
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