Thunderbolt to VGA problems.

Folks, I just setup two Mac Pro computers (late 2013 cylindrical model) and am having problems on both with Thunderbolt to VGA adapters. I get a line at the top of the screen that flickers at a constant rhythm of sorts and the desktop doesn't fill the screen. In fact the dock is pushed a little down beyond the edge of the screen.
I have two 24" monitors plugged into both computers. There's no problem with anything plugged in via DVI or HDMI, but it does affect these two brand new out of the box Samsung and HP monitors connected via Thunderbolt to VGA adapters.
I found this link and firmware to try and remedy the problem, but when run it just said it couldn't find a supported MiniDisplay Port to VGA adapter.
Any ideas folks?

I suspect that the firmware is only applicable to one specific brand of adopter.
I have used Apple mini displayport to VGA adopter on my 2013 Mac Pro without problems for 1080p like your HP monitor.
I suspect a problem with the adopter. However, try resetting the SMC and PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
About NVRAM and PRAM
otherwise try another brand adopter. I would try min displayport to either HDMI or DVI if you can get them and get the right cable

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Thunderbolt to vga problem

Hi everyone,
i have a MacBook Pro retina screen. i have bought a thunderbolt to vga adapter from ebay. i tried The adapter on a computer runs Windows os. And it works fine. when i connect it to my mac, only The screen flashes but it doesn't work. There is Nothing in system pre / screen.
is there any spesific adapter for retina screen, or any thunderbolt to vga adapter can work?
What should i do to connect my mac to a screen via vga?

Hi everyone,
i have a MacBook Pro retina screen. i have bought a thunderbolt to vga adapter from ebay. i tried The adapter on a computer runs Windows os. And it works fine. when i connect it to my mac, only The screen flashes but it doesn't work. There is Nothing in system pre / screen.
is there any spesific adapter for retina screen, or any thunderbolt to vga adapter can work?
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Hey guys,
Pretty much what the title says.....
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(Benq monitor running fine on the hdmi port)
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Thanks,
Darren

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Sorted.
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HT2494 Reboot my Macbook Pro when using external monitor w Thunderbolt to VGA adapter

I have a Macbook Pro running 10.9.2 OS X (MacBookPro8,1). I never had any problem w that but yesterday i bought an external monitor (kind of old model from LG - L1900E). Well, i was trying to extend my Macbook Pro display through a Thunderbolt to VGA adapter. It worked at first but it started rebooting my Mac. I just disconnected that and the reboot stopped.
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I am kind of disapointed because i heard that one of the major items the new OS X was about external displays.....
Looking forward a help from an apple specialist, Tks !
Marcello H. Ishida.

Examine these instructions:
http://support.apple.com/kb/ht3131
Ciao.

Reboot my Macbook Pro when using external monitor w Thunderbolt to VGA adapter

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Marcello H. Ishida.

Examine these instructions:
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Ciao.

Thunderbolt to VGA works find, to HDMI no longer works

I have a late 2011 model Macbook Pro, running the latest Yosemite update. I can plug in my Thunderbolt to VGA adapter and everything works just fine. But when I plug in my Thunderbolt to HDMI adapter, the display will not be detected. I've tried holding option to manually detect displays and nothing happens. The screen will flicker as if it senses another display has been connected. I don't know if this is due to Yosemite, for it worked just fine before the update.

Hi all,
I was having the same problem with Yosemite and thunderbolt to HDMI but have found a sort of a solution or at least a bit more info that might lead to someone having a eureka moment. I have a Mac Book Pro, my partner a Mac Book Air. I bought a thunderbolt to HDMI cable from eBay so my partner could plug her Air into the TV. When the cable arrived, it would not detect our LG TV from either computer. So a bit of playing around and this is what I found.
I plugged the cable from my Pro direct to the HDMI port on the TV and nothing.
I also tried from the Pro to the HDMI port on amplifier of the surround sound system and again nothing.
However, if I plug the cable from my PRO directly to the TV HDMI and select that HDMI port on the TV initially still nothing. But if I then plug a normal hdmi cable from my amp to the Mac Pro's HDMI port, suddenly the thunderbolt cable works and the Display Preferences see the LGTV. I checked that the correct hdmi port was selected for the direct connection and I could even turn off my amplifier to make sure that I was not seeing the wrong signal and it still worked.
It seems that there needs to be either a base signal or an earthing through the MacBook Pro's HDMI port for it to switch into an external monitor mode that will detect a thunderbolt to HDMI connection. This is fine for my Mac but as my partner's Air only has a thunderbolt port and no HDMI port it still doesn't work with her MAC.
Hopefully someone will see this and have a brainwave.

Strange issue with external monitor, only working when external speakers plugged in (using Thunderbolt to VGA adaptor)

Hey – I am having a very strange issue with my external monitor; where it only works if my external speakers are plugged in and connected.
I am using a late 2011 Macbook pro, running Mavericks 10.9.4, along with an MBox 2 (USB Audio Interface), and two powered speakers (KRK Rokit 5). This setup has had no issues. I have just acquired an external monitor (Benq T2200HD), which I am using with a thunderbolt to VGA adaptor (a cheap Chinese knockoff adaptor).
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Well, I went back into Best Buy to test on 3 other laptops (2 Asus, and their floor model for this Sony). It seems to be doing the same problem so at least I was able to rule out broken hardware issue on my particular laptop.
Here's what I did to test:
Since I couldn't really install Adobe Premiere on their machines, I used the DVIO software (http://www.carr-engineering.com/dvio.htm) and a 5 min clip I captured. I transferred onto their machines, hooked up my Sony D8, and attempted to play the video. It would play for 15 seconds and then stop and jitter with a loud noise (like it does on my laptop). I even tried changing each machine's firewire driver to the legacy one and same results. I pulled a brand new 4 pin to 4 pin firewire cable off their shelf and still the same problem.
I think I've nailed it down to Win7x64 bit Home Edition not playing nice with Firewire driver. Very annoying. I can't find any concrete evidence of this from other users on any of the forums that have my particular problem, but from my own testing, it's all I can conclude.
I have 2 other things I can try:
1. Opening the laptop and looking at the firewire to maybe find appropriate driver (ugh, I don't want to have to open this thing up).
2. Upgrading to Win7x64bit Pro and possibly testing with XP on the new MS Virtual PC (http://www.microsoft.com/windows/virtual-pc/). I can't do it with my Home edition apparantly.
Who needs to view video on an external TV anyways....sheeesh...(scarcasm).
Tim

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Everything continues to work if i disconnect the adapter again (except for the blue screen sometime).
If i first connect the connector and then the vga adapter the same problems occur.
I tried restarting, with connected from the start then it hangs in the bootscreen
Connecting later on when booted
Resetting nvram with connector connected
Resetting nvram without connector connected
I also have a thunderbolt to hdmi connector and that works fine.
Any suggestions?
Thanks in advance.

Seems the adapter that the icentre sold doesn't work with my mac (*** :|), they replaced it with another version (€5 expensiver). This solved the problem.... pretty weird...

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Just a few weeks ago I purchased a new MBP Retina for my new work laptop. I contantly go from Windows, to OS X to demo hardware to customers. Problem I am having, is that as soon as I connect the Thunderbolt to VGA adapter in Bootcamp on Windows7, it forces 640x480 and I dont get the option to change. The adapter runs fine in OS X.
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Charles

I have this same problem, discovered today in front of customers, when hooking up to their VGA projector. The VGA adaptor did not work very well with OSX either so running Windows under Parallels did not work either. Back in the office, I experimented with our old VGA projector, same problem, but I could get OSX to display and thus Parallels. Back on the Win 7 bootcamp, resolution is grayed out and set to 640x480, too small to do anything. I tried another sugestion of updating the Nvidia driver in Windows, to the latest version but that did not help. The only other suggestion that worked for others is to get a USB3 to VGA adaptor. Aparently Apple needs to update their bootcamp drivers for the mini display/thunderbolt port. So until that happens, perhaps the USB3 adaptor will be the way to go. I'm going to order one now since I cannot find it in the local apple stores or Best Buy.

Thunderbolt to VGA adapter issues

Hi guys,
I have bought a THUNDERBOLT TO VGA adapter to duplicate my screen on my TV, but when i plug in it my TV doesn't show anything. It shows just "Control signal", but I don't know how fix this problem.
Could you help me?
Thank you !

I have this same problem, discovered today in front of customers, when hooking up to their VGA projector. The VGA adaptor did not work very well with OSX either so running Windows under Parallels did not work either. Back in the office, I experimented with our old VGA projector, same problem, but I could get OSX to display and thus Parallels. Back on the Win 7 bootcamp, resolution is grayed out and set to 640x480, too small to do anything. I tried another sugestion of updating the Nvidia driver in Windows, to the latest version but that did not help. The only other suggestion that worked for others is to get a USB3 to VGA adaptor. Aparently Apple needs to update their bootcamp drivers for the mini display/thunderbolt port. So until that happens, perhaps the USB3 adaptor will be the way to go. I'm going to order one now since I cannot find it in the local apple stores or Best Buy.

Windows 7 Bootcamp and Thunderbolt to VGA Adapters for External Displays MacBook Pro i5?

Is it possible to connect an external moniter to a MacBook Pro using a Thunderbolt to VGA adapter in Windows 7 (professional)? I have tried and tried, when booting, both moniters (both laptop and external) show the "Starting Windows" page, but the external blacks out on the user selection screen. That gives me hope... is there a driver out there that will let me use the external display in Windows 7?
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Thanks.

You shouldn't require a driver. I would try booting as usual, then plugging in your external display. In windows, you can hit "command-P" to toggle between your external display options (mirror, extend, etc.). Once you do that, you should see the new display show up.

Thunderbolt to VGA and and HDMI to DVI running at once

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Yes. You can use to monitors on a Mac Mini. You can select to have them mirror one another or at an extended screen/desktop.

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Thank you so much, I'll try to get one of Mini-Displayport-to VGA cables.

Is there such a thing as a "thunderbolt to VGA" adapter?

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A notable peculiarity of Thunderbolt is that it uses exactly the same connector as Mini Display Port, and that's not all. The Thunderbolt connector also carries Mini Display Port video signals. That means you can plug a Mini Display Port video cable/adapter in to a Thunderbolt connector and your monitor will work.
If you plan to do other things with your Thunderbolt connector and don't want it wasted on a monitor, you can also choose an HDMI --> DVI adapter, which for your purposes will be functionally equivalent.
You can even use both at the same time.
- Anonymous
http://x704.net/bbs/viewtopic.php?f=13&t=6134
http://store.apple.com/us/product/MB572Z/B/mini-displayport-to-vga-adapter

Thunderbolt to VGA problems.

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