EliteBook 8470p Dual External Display Max Resolution

I am currently using a docked HP Elitebook with two external monitors at (1920x1200) with no issues. I wanted upgrade to two 4k external monitors (3840x2160). Does anyone know if the Elitebook can handle this?

Either DVI or DisplayPort will drive that resolution, though you may need to use a dual-link DVI adapter.
DisplayPort is a newer technology and offers the same resolution support as DVI.

Similar Messages

Dual external displays but different resolutions--why?

I have a 2014 MacBook Pro Retina. I have two identical HP Pavilion 22bw monitors attached via the display ports. One has satisfactory resolution, one does not. They display the same settings. I do not understand why one looks so different.

Hi joegage,
I'm sorry to hear you are having issues with one of your external displays. If they are identical monitors with identical settings, you may find the troubleshooting steps outlined in the following article helpful in isolating the issue:
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Regards,
- Brenden

Unable to use external display native resolution

Dear all,
Here is the current setup I'm using :
MacbookPro 15", hi res, Mid 2010 with Mac OS 10.6.6, software up-to-date
Apple MiniDisplayPort to VGA Adapter Firmware 1.03
IIYAMA Prolite E2607WSD, a 26" monitor with native resolution of 1920x1200 @ 60Hz
When connecting the MiniDisplayPort to VGA adapter to the VGA cable, the MBP doesn't enable me to set the external native monitor resolution of 1920x1200 with extended desktop. The maximum available resolution the macbookpro is able to diaply is 1920x1080.
What I tried :
-using high performance graphics in the energy saver settings
-using clamshell mode
-using mirroring mode
-reset PRAM
-reset SCM
-delete com.windowserver.plist
-use SwitchResX.app and DisplayConfigX.app to force the native resolution
To make sure that the monitor was correctly behaving, I tried with a PC with WinXP, and I was able to get max resolution of 1920x1200 without an issue. I also tried with a Macbook 2008 with 10.5.6, and with it's own DisplayPort to VGA adapter (the "normal size" one, not the "mini" one I'm using with the MBP), and it worked as well with the native resolution of 1920x1200.
I 'm coming to the conclusion that either the minidisplayport to vga adapter doesn't accept any resolution higher than 1920x1080 or that the one I bought from Apple is not properly working, or that I should use the minidisplay port to DVI adapter (no HDMI here as an input for the monitor)...
I also browsed the forum and found a lot of similar issues, so I guess it's pretty common, but no workaround seems possible.
Does anybody in the community had the same issue and know how to solve it ?
Thanks in advance.
PolCls

Hello BSteely,
I actually tried to get the EDID information and to replicate them as much as possible but everytime I tried a custom resolution, after reboot, SRX will say " the system didn't accept this setup"... and the proper resolution is not available..
See below the data :
DDC block report generated by SwitchResX version 4.2 for display
PLE2607WSD
------------------- RAW DATA ------------------------
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 | 00 FF FF FF FF FF FF 00 26 CD 03 66 21 02 00 00
1 | 0C 14 01 03 68 37 22 78 2A 7B 65 A5 55 48 99 26
2 | 12 50 54 BD EF 80 71 4F 81 80 81 8F 95 00 95 0F
3 | A9 40 B3 00 D1 C0 7D 4B 80 A0 72 B0 2D 40 88 C8
4 | 36 00 26 58 21 00 00 1C 00 00 00 FF 00 31 31 30
5 | 35 36 30 31 32 30 30 35 34 35 00 00 00 FD 00 37
6 | 4C 1D 51 14 00 0A 20 20 20 20 20 20 00 00 00 FC
7 | 00 50 4C 45 32 36 30 37 57 53 44 0A 20 20 00 11
< 00FFFFFF FFFFFF00 26CD0366 21020000 0C140103 68372278 2A7B65A5 55489926 125054BD EF80714F 8180818F 9500950F A940B300 D1C07D4B 80A072B0 2D4088C8 36002658 2100001C 000000FF 00313130 35363031 32303035 34350000 00FD0037 4C1D5114 000A2020 20202020 000000FC 00504C45 32363037 5753440A 20200011 >
{ 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x26, 0xCD, 0x03, 0x66, 0x21, 0x02, 0x00, 0x00, 0x0C, 0x14, 0x01, 0x03, 0x68, 0x37, 0x22, 0x78, 0x2A, 0x7B, 0x65, 0xA5, 0x55, 0x48, 0x99, 0x26, 0x12, 0x50, 0x54, 0xBD, 0xEF, 0x80, 0x71, 0x4F, 0x81, 0x80, 0x81, 0x8F, 0x95, 0x00, 0x95, 0x0F, 0xA9, 0x40, 0xB3, 0x00, 0xD1, 0xC0, 0x7D, 0x4B, 0x80, 0xA0, 0x72, 0xB0, 0x2D, 0x40, 0x88, 0xC8, 0x36, 0x00, 0x26, 0x58, 0x21, 0x00, 0x00, 0x1C, 0x00, 0x00, 0x00, 0xFF, 0x00, 0x31, 0x31, 0x30, 0x35, 0x36, 0x30, 0x31, 0x32, 0x30, 0x30, 0x35, 0x34, 0x35, 0x00, 0x00, 0x00, 0xFD, 0x00, 0x37, 0x4C, 0x1D, 0x51, 0x14, 0x00, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xFC, 0x00, 0x50, 0x4C, 0x45, 0x32, 0x36, 0x30, 0x37, 0x57, 0x53, 0x44, 0x0A, 0x20, 0x20, 0x00, 0x11, }
Valid EDID block: checksum passed
------------------- MAIN EDID BLOCK -----------------
EDID Version........1.3
Manufacturer........IVM
Product Code........870 (0366) (6603)
Serial Number.......00000221
Manufactured........Week 12 of year 2010
Max H Size..........55 cm
Max V Size..........34 cm
Gamma...............2,20
Display Supported Features:
Power Management: Active off
Display type:
RGB color display
Display is non continuous frequency
Default color space is not sRGB standard
Preferred timing mode includes Native Pixel Format
Input signal & sync:
Analog input with: 0.700V / 0.000V
Composite Sync
Color info:
Red x = 0,646 Green x = 0,283 Blue x = 0,149 White x = 0,313
Red y = 0,335 Green y = 0,601 Blue y = 0,072 White y = 0,329
Established Timings:
720 x 400 @ 70Hz
640 x 480 @ 60Hz
640 x 480 @ 67Hz
640 x 480 @ 72Hz
640 x 480 @ 75Hz
800 x 600 @ 60Hz
800 x 600 @ 72Hz
800 x 600 @ 75Hz
832 x 624 @ 75Hz
1024 x 768 @ 60Hz
1024 x 768 @ 70Hz
1024 x 768 @ 75Hz
1280 x 1024 @ 75Hz
Manufacturer Reserved Timings:
1152 x 870 @ 75Hz
Standard Timing Identification:
#0: 1152 x 864 @ 75Hz (714F)
#1: 1280 x 1024 @ 60Hz (8180)
#2: 1280 x 1024 @ 75Hz (818F)
#3: 1440 x 900 @ 60Hz (9500)
#4: 1440 x 900 @ 75Hz (950F)
#5: 1600 x 1200 @ 60Hz (A940)
#6: 1680 x 1050 @ 60Hz (B300)
#7: 1920 x 1080 @ 60Hz (D1C0)
Monitor Description blocks:
Descriptor #0 - Timing definition:
Mode = 1920 x 1200 @ 59,885Hz
Pixel Clock............. 193,25 MHz Non-Interlaced
Horizontal Vertical
Active.................. 1920 pixels 1200 lines
Front Porch............. 136 pixels 3 lines
Sync Width.............. 200 pixels 6 lines
Back Porch.............. 336 pixels 36 lines
Blanking................ 672 pixels 45 lines
Total................... 2592 pixels 1245 lines
Scan Rate............... 74,556 kHz 59,885 Hz
Image Size.............. 550 mm 344 mm
Border.................. 0 pixels 0 lines
Sync: Digital separate with
* Positive vertical polarity
* Negative horizontal polarity
Descriptor #1 - Serial number:
1105601200545
Descriptor #2 - Monitor limits:
Horizontal frequency range.......29-81 kHz
Vertical frequency range.........55-76 Hz
Maximum bandwidth unspecified
Descriptor #3 - Monitor name:
PLE2607WSD
What do you think are the parameters I should use ?
Thanks in advance;
Paul

External display - maximum resolution only works in safe mode on MBP

I'm having an issue with an external display connected to a 2012 non-retina MacbookPro 15" i7 running 10.9. Monitor is Dell U2713HM, which has a maximum resolution of 2560x1440, and is connected via a Mini-Dipslayport to Displayport cord.
My setup has been working great for over a year, where while at my office I use the macbook closed in "clamshell mode" with the Dell monitor being the only display in use, running at 2560x1440. However today when I came into my office and connected to the dispay as usual, the resolution on the Dell was noticably scaled. System preferences is showing it running Scaled at 1080p, and when I select Best for Display it stretches to a very wide and distorted resolution. I can hold alt and click the Scaled button to display additional resolutions, however the maximum resolution listed is 1600x1200. Same problem regardless of clamshell, mirror, or extended desktop modes.
I've been trying to track down the problem, and have run though the usual procedures: restart, shutdown, reset PRAM, reset SMC, check cord connections, verify disk, repair disk permissions - all to no avail. However when I boot in safe mode the display runs as it should at 2560x1440 without issue, which lets me know its not a problem with the cord or connectioin, but rather something on the OS / GPU side.
I can't for the life of me figure out what is causing the issue. Considering its been working fine for quite some time, and I've made no unusual changes to the MBP in the past 48 hours when the display was working properly, I'm not really sure where to go from here. Hoping to not have to migrate to a new user or repartion my HDD.
Any suggestions on possible solutions?
Thanks.

I stumbled upon a fix. Still not sure what caused the issue in the first place, but for anyone having the same issue, the display override script contained on the site below seems to have fixed the issue.
http://embdev.net/topic/284710

Missing external display 1920x1080 resolution, only shows 1680x1050... Please HELP !

When connecting my Macbook Air (mid 2011) to an external LG 22" Display (M2241A) which supports a native resolution of 1920x1080, the closest setting available in the display preferences is 1680x1050, and aspect ratio is really distorted at this size. I use an Apple mini-display-port to HDMI, and HDMI cable to connect the Monitor.
What can I do to correct this problem ? How do I make the 1920x1080 available and get rid of the distortion ?

Thanks for your quick answer, but... When I use the 1080p resolution, I need to use Underscan, and the colors change, the fonts get all blurry and overall definition goes really bad. Really seems like a TV setting.
Maybe okay to watch a movie, but not to work in Photoshop and get design work done properly.
The external display only has HDMI + VGA inputs.
So I guess the next step is to try finding a different connector (mini-display to VGA) But I am now in Chile, Patagonia, and believe me, this will be quite a challenge to find !!! Also, no way to buy at Apple online store and get it shipped here in Chile... :-(((

How To Run Dual External Displays

Hello,
I have a MacBook Pro 13". I am wondering if it is possible to run dual external monitors? I have the MiniDisplayPort To DVI adapter, works great with one monitor, but can I run dual? Thanks.

You could try plugging in this USB adapter, it says you can plug in up to six per computer. If you want two externals, you should only need one of those USB adapters because the first monitor should be plugged into your superior onboard DisplayPort.
Just bear in mind that when you use these USB adapters, the top resolution supported will be lower than the DisplayPort and also it will be a lot slower. Playing games or editing video/animation might not work well on the adapters as cheap as you want.

Dual External Displays?

Is there anyway to get dual external LCD's working with the macbook? If so please let me know, thanks.

Sort of
Not really but here is a device that will simulate that
Matrox DualHead2Go
And you can read about some experiences with it here:
http://voice.firefallpro.com/2006/02/mac-mini-dual-monitors-using.html

External Display native resolution suddenly not available

Hello,
I'm using a Westinghouse LCM-22w3 external monitor with my MBP, connected via a DVI-to VGA adapter. I've used this computer/monitor setup for quite some time with no problem. Yesterday, I hooked my computer up to my 46" Samsung HDTV with no problem.
When I hooked my computer back up to the Westinghouse, the native resolution (1680x1050) was no longer available. Instead, the monitor hooks up at 1600x1000. Strangely, though, the EDID information appears to suggest that 1680x1050 should be available. Here's the EDID:
DDC block report generated by SwitchResX version 4.1.1 for display
LCM-22w3
------------------- RAW DATA ------------------------
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 | 00 FF FF FF FF 91 FF 00 5C 85 03 22 01 01 01 01
1 | 13 11 01 03 68 2F 1E 78 2E C5 85 A4 59 49 9A 24
2 | 12 50 54 BF EF 00 81 80 81 40 71 4F 95 00 95 0F
3 | B3 00 81 C0 81 00 21 39 90 30 62 1A 27 40 68 B0
4 | 36 00 D9 28 11 00 00 1C 00 00 00 FD 00 38 4C 1E
5 | 52 10 00 0A 20 20 20 20 20 20 00 00 00 FF 00 30
6 | 0A 20 20 20 20 20 20 20 20 20 20 20 00 00 00 FC
7 | 00 4C 43 4D 2D 32 32 77 33 0A 20 20 20 20 00 1D
< 00FFFFFF FF91FF00 5C850322 01010101 13110103 682F1E78 2EC585A4 59499A24 125054BF EF008180 8140714F 9500950F B30081C0 81002139 9030621A 274068B0 3600D928 1100001C 000000FD 00384C1E 5210000A 20202020 20200000 00FF0030 0A202020 20202020 20202020 000000FC 004C434D 2D323277 330A2020 2020001D >
Invalid EDID block: checksum failed. Last byte should be 8B
------------------- MAIN EDID BLOCK -----------------
EDID Version........1.3
Manufacturer........WDE
Product Code........802 (0322) (2203)
Serial Number.......01010101
Manufactured........Week 19 of year 2007
Max H Size..........47 cm
Max V Size..........30 cm
Gamma...............2.20
Display Supported Features:
Power Management: Active off
Display type:
RGB color display
Display is non continuous frequency
Default color space is sRGB standard
Preferred timing mode includes Native Pixel Format
Input signal & sync:
Analog input with: 0.700V / 0.000V
Composite Sync
Color info:
Red x = 0.644 Green x = 0.286 Blue x = 0.143 White x = 0.313
Red y = 0.348 Green y = 0.603 Blue y = 0.070 White y = 0.329
Established Timings:
720 x 400 @ 70Hz
640 x 480 @ 60Hz
640 x 480 @ 67Hz
640 x 480 @ 72Hz
640 x 480 @ 75Hz
800 x 600 @ 56Hz
800 x 600 @ 60Hz
800 x 600 @ 72Hz
800 x 600 @ 75Hz
832 x 624 @ 75Hz
1024 x 768 @ 60Hz
1024 x 768 @ 70Hz
1024 x 768 @ 75Hz
1280 x 1024 @ 75Hz
Manufacturer Reserved Timings:
Standard Timing Identification:
#0: 1280 x 1024 @ 60Hz (8180)
#1: 1280 x 960 @ 60Hz (8140)
#2: 1152 x 864 @ 75Hz (714F)
#3: 1440 x 900 @ 60Hz (9500)
#4: 1440 x 900 @ 75Hz (950F)
#5: 1680 x 1050 @ 60Hz (B300)
#6: 1280 x 720 @ 60Hz (81C0)
#7: 1280 x 800 @ 60Hz (8100)
Monitor Description blocks:
Descriptor #0 - Timing definition:
Mode = 1680 x 1050 @ 59.954Hz
Pixel Clock............. 146.25 MHz Non-Interlaced
Horizontal Vertical
Active.................. 1680 pixels 1050 lines
Front Porch............. 104 pixels 3 lines
Sync Width.............. 176 pixels 6 lines
Back Porch.............. 280 pixels 30 lines
Blanking................ 560 pixels 39 lines
Total................... 2240 pixels 1089 lines
Scan Rate............... 65.290 kHz 59.954 Hz
Image Size.............. 473 mm 296 mm
Border.................. 0 pixels 0 lines
Sync: Digital separate with
* Positive vertical polarity
* Negative horizontal polarity
Descriptor #1 - Monitor limits:
Horizontal frequency range.......30-82 kHz
Vertical frequency range.........56-76 Hz
Maximum bandwidth unspecified
Descriptor #2 - Serial number:
0
Descriptor #3 - Monitor name:
LCM-22w3
Any ideas? Switchresx didn't work, either

Well, you can move the file from the desktop back to its original location to at least get back to what you had before.
The file structure under Snow Leopard has changed and it's hard to keep up with this stuff. There is also now a com.apple.WindowServer.plist file in /System/Library/LaunchDaemons that you could try moving to the desktop and restarting. I dunno. Same rule applies.....if it doesn't help, move the file from the desktop back to its original location.

X200 external display maximum resolution?

I can only get 1440x900, when my external LCD has a native resolution of 1680x900. Is this just a limitation?

I am having the exact same problem on an X200s with a Samsung SyncMaster 2033sw, 19" LCD at 1600x900. There is no way to get the external LCD to display at 1600x900, and the max is 1440x900. I have tried Intel video drivers (both patched and standard) as well as Lenovo drivers. I think it is a BIOS limitation, for what reason I do not know. The chipset supports 1600x900 as far as I can tell. The Intel display tray does not show this resolution.
Message Edited by harryc on 05-25-2009 07:15 AM

Problem driving dual external displays on wakeup

I posted the following here back in February and it was archived without resolution (one other subscriber noted having this problem too). Still having this difficulty so I'm reposting ...
I am having occasional irregularities with my Mac re-driving a dual-display setup either waking from sleep or after a normal energy-saving screen shutdown.
The setup: a new MacBook Pro 15" with Snow Leopard. Normally I work with the cover closed using two Acer external monitors, both connected via DVI. The main monitor (H - arranged horizontally) is connected via the Apple mini-to-DVI adapter. The secondary monitor (V - arranged vertically) is connected via an Iogear USB 2.0 External DVI Video Card, attached to the machine via a Belkin USB hub.
The problem: sometimes when I wake the machine, or come back to it after the monitors have been powered down, the H screen will present nothing but snow - a complete black-and-white pixelation effect. Sometimes this will stop and the login prompt appears and all is normal. More often I have to wait for the monitors to power down again, then try to wake them. Sometimes this clears it, other times not. In the worst case I can not get the monitors redriven and have to open the machine and effect a restart.
I have also noticed at times that the Mac seems to forget about one or the other monitor, driving just one and moving all the windows over to it. Again, have to restart to bring everything back in line.
Sometimes I can go weeks without this occurring, and other times it will happen nearly every time.
The Mac OSX software is up to date and as far as I can tell I have the latest Iogear driver (although it's not the Iogear-attached monitor that pixelates).
Any thoughts on what might be wrong, or what steps I can take to diagnose the problem?

This question was never really answered but I reposted it since it was moved to archive.

External display incorrect resolution when MBP lid is closed

Hi,
I've just bought a 24" Samsung monitor for use with my 2011 MBP. The optimum resolution for the monitor is 1920 x 1080. I ahave it hooked up through a minidisplay to vga adapter. When I have this resolution selected in extended display mode it works fine, however when I close the lid and run the monitor with the same resolution as the main display, the image gets squashed and the screen flickers, I can also see faint lines in the background and the display is not centred, leaving black gaps on either side of the screen.
The frustrating thing is it was originally running fine before I temporarily changed the resolution in display preferences when in closed lid mode. Is there any kind of fix for this?? I know it's not the monitor's fault because it's displaying the correct resolution when in extended desktop and on other systems.
Any help would be greatly appreciated!
Chris

tjk wrote:
chrisfromuxbridge wrote:
So I've tried everything I can find on the internet relating to resetting display settings on mac osx, including resetting PRAM and SMC, tried deleting com.apple.windowserver.plist from the preferences folder, tried starting in safe mode and reselecting the correct resolution (i.e. switching to something different and then switching back to 1920 x 1080), nothing. What else can I try??
Any bossy third party apps trying to control things?
Run Apple Hardware Test, and/or a trip to the "genius" bar.
No thrid party apps have access to my display prefs as far as I know. And the hardware test did not indicate that anyhting was wrong. I would like to leave the "Genius" bar as a last resort, they weren't much help last time...
Ok so moving the menu bar is allowing me to use the external as native desktop, but this doesn't fix the resolution problem when I close the lid even though the resolution in display prefs is set the same. Is it possible then to tell the mbp not to sleep when I close the lid?? I know you can do this in windows. Please note that I am still using Snow Leopard v10.6.8

2012 iMac 21.5 inch - dual external displays?

I bought myself a new 24" Asus 1920x1080 monitor for Christmas. I did this in anticipation of buying a new Mac Mini when they were released this year. Unfortunately I can't wait any longer for the Mac Mini. I have a video editing job that I must start right away. So I've decided to spend the extra money and buy a new 21.5 inch 2.7GHz iMac. Here is my problem. It is 2 inches too tall for the useful side of my desk. It is also smaller than my Asus monitor. So I really want to be able to use the Asus as my main workspace, and my 47" Samsung HDTV as the video display. I know the iMac will only support 2 displays. My question is, will it support 2 displays not including the built-in monitor. I would like to buy 2 Thunderbolt to HDMI connectors and leave the iMac monitor black. Will the iMac do that? Also, the literature says it will only support a 30 inch external monitor. I'm assuming that it won't care as long as the resolution is only 1920x1080, but is that a correct assumption? I don't know what to do anymore. I already have a MBP and I can't afford to spring for a second. Ideally I'd love to wait for the new Mac Mini, but it's starting to look like it may not come out until the next generation of Intel chips are released, maybe not even this year. I've already been waiting since last October. If I can't turn the iMac monitor off, I may have to buy a new desk with more clearance. Any help would be appreciated. Also, just to make sure, FCP 7 will run on this iMac right? I'm sure it will, but I can't wrap my head around FCPX and I want to avoid any nasty surprises. Thanks.

I don't know which softwares you will use for video editing, but if I were you, I would buy the iMac 27" models instead of 21.5". It is because for 27" model, you can add RAM easily at the back of iMac. Therefore, you won't afraid for having not enough RAM. However, for 21.5" model, you cannot add RAM by yourself unless you are brave enough to remove the screen, which may damage other part of iMac.
If you have budget constraint, I will recommend you to choose the sixth choice. It is because video-editing depends on CPU, RAM and Display Card mainly, especially RAM, which I strongly suggest you to have at least 16 GB. For the CPU, the 3.1 GHz Qual Core i7 performs better than with i5-processor significantly. The i7 CPU has a technology which allows two threads to run simultaneously on each core, so a qual-core iMac has eight virtual cores.

MBP i7 and Dual External Displays

is it possible to run 2 external 1200x1600 dvi(digital) displays from a MacBook Pro 15" i7?

The cheapest way to do this is probably to use the mini-display port for one monitor , and a USB or firewire based video out card for the other.
It may produce some latency issues , but if you need a cheap fix it might do the job for you.
http://daggle.com/macbook-pro-multimonitor-4-monitors-at-once-1577 may give you some ideas on the matter.
Cheers
Rod

External Display driver for retina

Hi there..
I'm using Macbook pro retial from 3 month ago
and using External display, max resolution is 2560X1880 and 2560X1440
the problem is screen is little blurred
so i was tested at the APPLE CINEMA MONITOR
the result was same..
and I was tested at the PC in same specipication
all display was good.
I think it is caused by video driver of RETINA, THE SCALING...
is there anybody who find a solution?

Hello
Like Joao said, the graphic driver for this unit is only available for Xp and W2k.
http://www.csd.toshiba.com/cgi-bin/tais/su/su_sc_modItemList.jsp
Well, you can check other Toshiba notebooks which have the same graphic card and try to download this driver.
You can also try to search on the European Toshiba website for the units with the same graphic card.
http://eu.computers.toshiba-europe.com/cgi-bin/ToshibaCSG/download_drivers_bios.jsp
Good luck
Bye

External Display Problem - Frequency out of range with lid closed

I have read this - http://docs.info.apple.com/article.html?artnum=86286 - it should work, but it does not.
I have a black macbook, an apple usb keyboard, a usb mouse and a19" gateway lcd display (max resolution 1440x900). Everything used to work great. Now for some reason no matter what resolution & mhz I set the external display and the macbook to it will not work with the lid closed, I can set bot to the lowest settings (640 x 480) and when I close the lid and wake the mac the message on the external display says "Frequency out of range." I will work fin in either mirror or extended mode with the lid open. Any suggestions? I've tried resetting the pram already and run the disk repair on the start up disk.

I never did figure it out - but the problem has been solved..
I did tried to trash a bunch of preference files - no joy.
I fixed it the old fashioned way - I installed a fresh system (don't waste your time with an archive and install - it just imported the corrupt files). Works fine now..

EliteBook 8470p Dual External Display Max Resolution

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