Currently Being ModeratedOct 11, 2012 8:02 AM (in response to HagenHansen)
Try booting from your recovery partition (hold down left "Option" key while you boot) and you will be able to
select the recovery partition) --- Do this WHILE connected to your external TV... - look and see if the TV shows
the fabric screen background on the TV.. this means the HW is still working, and that the problem is in either
the 10.7.5 "supplemental" update, or the 10.7.5 update that preceded it.
In either case, I has to restore to a time when I had 10.7.4 to get mine to work again.
OnceI did that, I confirmed that 10.7.4 worked with all my external monitors using both Thunderbolt to DVI,
and Thunderbolt to VGA adapters (and also using the Thunderbolt to DVI along with a Belkin DVI to HDMI cable) - The TV's I tested 10.7.4 with ALL WORKED (autodetected and no problems) were:
Hitachi Plasma 55 inch --> works with all the cable combos..
LG FLATRON W2352V --> works with all cable combos.
Visio small flatscreen TV in my kitchen that I can't move to read the model number without a great hassle --> works at least with the HDMI..
Lenovo 23 inch monitor I have to use at work --> works with both the thunderbolt to DVI and the thunderbolt to VGA adapters.
I confirmed that upgrading again to 10.7.5 breaks ALL of these. (complete loss of the macbook pro's ability to
even recognize that any external monitor is connected whatsoever) -- unless I boot the revoery partition (which I think has stayd at an earlier level).
My Macbook pro is an early 2011 :
Model Name: MacBook Pro Model Identifier: MacBookPro8,3 Processor Name: Intel Core i7 Processor Speed: 2.3 GHz Number of Processors: 1 Total Number of Cores: 4 L2 Cache (per Core): 256 KB L3 Cache: 8 MB Memory: 8 GB Boot ROM Version: MBP81.0047.B27 SMC Version (system): 1.70f5
Right now - it's having to stay on 10.7.4 until Apple figures this mess out.
AMD Radeon HD 6750M:
Chipset Model: AMD Radeon HD 6750M
PCIe Lane Width: x8
VRAM (Total): 1024 MB
Vendor: ATI (0x1002)
Device ID: 0x6741
Revision ID: 0x0000
ROM Revision: 113-C0170L-573
gMux Version: 1.9.24
EFI Driver Version: 01.00.573
Resolution: 1920 x 1200
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Resolution: 1920 x 1080 @ 60 Hz
Pixel Depth: 32-Bit Color (ARGB8888)
Tried it several times - (upgrading to 10.7.5) --> it's somewhat "better" before the "supplemental update" because if you get to 10.7.5 BEFORE the 10.7.5 "supplemental update" then you can at least go delete all these files: and get SOME of the external monitors above to be reognized:
(also check your /Users/yourid/Library/Preferences path for these same files, and if they exist - rm them and reboot) --> then the external displays worked (some of them).
WARNING: Once the 10.7.5 "supplemental" update gets installed on my machine - I lose ALL hope (removing these files and rebooting no longer works to restore functionality to say, the LG2353V which
is my main photography/videography display with both Final Cut X and Lightroom).
Hope you have a Time Machine backup from 10.7.4 - that you can get yourself back to function with.
Currently Being ModeratedOct 16, 2012 9:29 AM (in response to RobertMan)
RoberMan: Thank you for the very detailed description... I "made the mistake" of upgrading (without having any backup/time machine) and all my external displays (one LG and one Phillips) stoped working...
Following your instruction, I did the first check - selecting the recovery partition, and the external display worked normally...
The interesting thing was that once I restarted my computer on normal mode the external displays started working normally !!! I did not do anything. I think there must be some kind of reseting of the external displays properties/configurations...
This is however pretty annoying... every time we do an upgrade we have to pray so that it not break something... It is not the kind of support you expect when you spend 2.5K on a machine!