Minidisplay port can't detect a monitor

I have a S230U twist. The minidisplay port used to work with my VGA adaptor to project to a second monitor and a projecter, but recently it failed to work. I think it might be a hardware issue, but would like to try troubleshoot myself first. Could anyone suggest some methods to troubleshoot? The operating system is Windows 8.1.
Thanks. I appreciate your help.

It won't let me do that. When I go to the Network window of my System Preferences, it says Location: Automatic, and it won't let me click on New Location or on Edit Locations - they are pale grey.
Also, it says Show Network Port Configurations and it gives me six: Internal Modem, Airport, Bluetooth, Built-in Ethernet, Built-in Firewire, VPN (L2TP) whatever that is, and Ethernet Adaptor (en2), and I don't know if that is the cable from my friend's router or the new stick adaptor I bought (it doesn't change, whichever I have plugged in), but all these are also pale grey and I can't click on them or on the boxes marked New Rename Delete or Duplicate.
Also the stick adaptor I bought is not showing up in my Finder window as an attached device - shouldn't it? This means I can't eject it safely when I want to. There are no instructions enclosed with it or on the manufacturer's website.
When I click on Network Status with the cable attached, it says I am currently connected to the Internet via built-in Ethernet with the IP address 192.168.0.112 so I guess built-in Ethernet must be the cable. So if the Ethernet Adaptor (en2) is the adaptor stick, maybe it isn't being recognized by my computer because it is on channel 13?

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[SOLVED] xrandr can't detect other monitor

Hi,
Here is my problem, I try to make a dual sreen by myself just by editing Xorg .conf files. But I need to detect my second monitor first.
nvidia-setting detects my monitor but xrandr (-q) don't.
Here is the conf file of my monitor :
Section "Device"
Identifier "Default nvidia Device"
Driver "nvidia"
Option "NoLogo" "TRUE"
EndSection
Section "Monitor"
Identifier "Monitor0"
Option "DPMS"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1280x800_75.00"
EndSubSection
EndSection
Here is the xrandr -q result
agrum ~ $ xrandr -q
Screen 0: minimum 320 x 175, current 1280 x 800, maximum 1280 x 800
default connected 1280x800+0+0 0mm x 0mm
1280x800 50.0*
1024x768 51.0 52.0
832x624 53.0
800x600 54.0 55.0 56.0 57.0 58.0
720x400 59.0
700x525 60.0
640x512 61.0 62.0
640x480 63.0 64.0 65.0 66.0 67.0
640x400 68.0
640x350 69.0
576x432 70.0
512x384 71.0 72.0 73.0 74.0 75.0
416x312 76.0
400x300 77.0 78.0 79.0 80.0 81.0
360x200 82.0
320x240 83.0 84.0 85.0 86.0
320x200 87.0
320x175 88.0
Since nvidia can make a dual screen with my current configuration, I don't think I have to edit it. But I would like to knwo how to detect my second monitor, get its name, if its a VGA, DVI, CRT ...
Thanks.
Last edited by ApotheoZ (2010-07-03 11:15:17)

@wangcutopen, this thread is half a year old. I suggest you use nvidia-settings to do your setup for your nvidia card. Search the wiki for 'nvidia', or go to nvidia's linux forum. Try google after that.
If all those steps don't work, then open a new forum thread. But only after trying all those.
EDIT: re-opening, misread the dates on the post. My bad.
Last edited by ngoonee (2010-09-06 15:47:27)

Mac Pro USB port can't detect SD card reader.

My new macpro ( 2014) can't detect SD card reader with all 4 USB port ! I try to test with macbook Pro it's work properly ! What wrong with my USB port ?

This is too obvious, but neverthelees:
Have you checked that the card works on another computer?
Does a different USB or FW device work on the same computer port?
Is there a card actually in the reader?

Windows 10 elitepad in Dock can not detect VGA monitor

Windows 10 will not detect my external monitor. I loaded Winbdow 10 on elitepad 1000 about 2 days ago. This is the first time I've tried to use my extenal monitor. My elitpad is in the elitpad docking station.  The tablet id also in the expansion Jacket.  Under windows 81. I was able to duplicate my tablet display on to the external monitor over the VGA jack in the dock. Now tablet can not detect the VGA monitor.      The monitor is an HP2065 using the HP provided VGA to DVI cable.   I've tried rebooting with the monitor diconnected and then adding plugin it in . I've run the detect monitor several times.   Any one got a solution. The new HP support page does not even list tablet as an option for display support. Thank you

            Ok, thats the procedure I was talking about earlier. I did that bios default factory reset just now. First the version 6 and earlier. It didn't work so I tried version 7 and later and that didn't work. I then tried version 6 and earlier again only this time pushed F10 more rapidly and got right in right when I got to the F5 and enter portion. Then I pushed F10 again to save the change and enter again to close. The PC didn't boot up the next screen like the test said it would. So I did it all again and spent some time reading what was on the bios pages but accidently pushed ESC as the bios menu suggested instead of enter to close out   . No boot up screen again. I did another hard shutdown and then unplugged the cord for 5 minutes and this time the PC stayed off when I plugged it back in. The bios are set to default but I cannot get it to start again in safe mode or boot up. So if the power supply is working properly, and the monitor worked in safe mode, then the video card must be good. right?
          So I'm editing from the night before, its Monday morning here in Wi. and I'm sorry to say that after leaving the PC unplugged all night that when I plugged it back in this morning, the dumb thing started again without pushing the  start button.  So the only thing doing a recovery on the bios accomplished was to prove that my the video card can run the monitor in safe mode which is a good thing I guess. Hope someone has an idea as to what else I can try.-------thanks

Can't detect external monitor, shows only 640x480

Hi,
I'm using a Macbook Pro Unibody 13" 2.53GHz to connect to a Dell 2408WFP external monitor. It worked FLAWLESSLY with my old Macbook Pro using a DVI cable.
1) I first bought the infamous mini-Displayport to DVI adaptor. It didn't work (red static etc. check the page of this product on Apple's store website : you'll see it's a known issue). Cost me 35$
2) I then bought a mini-Displayport to Displayport cable. Thought it should work perfectly. It DOES NOT. The Macbook is apparently UNABLE TO DETECT my Dell and gives it a default resolution of 640x480. Which is ridiculous knowing that the Dell 2408WFP is capable of displaying 1900x1200.
It's really a pain. Does anyone know about this problem or have an idea how to solve it?
Thanks,
P.

Ok,
It was neither the cable nor the computer (thanks Apple). It was the monitor's EDID profile. Dell's problem.
There's two ways to fix this. 1) It is possible (I did it) to create a custom profile using SwitchResX. You'll need to hook up your computer to the monitor using a working connexion (I used DVI) and then use the "export" function in SwitchResX. It will give you a text file. In it you'll have enough data to fill SwitchResX' form to setup a custom profile. You'll then need to restart the computer, hook it with the Displayport cable and try to use this custom EDID profile. It worked for me.
For example (and hoping it will help others) here are the data you need to setup a custom profile for the Dell 2408WFP :
Descriptor #0 - Timing definition:
Mode = 1920 x 1200 @ 59,950Hz
Pixel Clock............. 154,00 MHz Non-Interlaced
Horizontal Vertical
Active.................. 1920 pixels 1200 lines
Front Porch............. 48 pixels 3 lines
Sync Width.............. 32 pixels 6 lines
Back Porch.............. 80 pixels 26 lines
Blanking................ 160 pixels 35 lines
Total................... 2080 pixels 1235 lines
Scan Rate............... 74,038 kHz 59,950 Hz
Image Size.............. 519 mm 324 mm
Border.................. 0 pixels 0 lines
Sync: Digital separate with
* Negative vertical polarity
* Positive horizontal polarity
2) Of course, you can call Dell and tell them about it. They are sending me a THIRD replacement monitor for this. Be prepared when you call them : I spoke with two representative (and among them a "senior technician") who DIDN'T know what was a Displayport. They even tried to sell me the idea that 640x480 is the native resolution for Displayport. It was hilarious. Really. I got them to look it up on Wikipedia.
Case solved. Apple 1 - Dell 0.
P.

Can't detect external monitor

I'm trying to plug a second monitor into my MacBook (13" aluminium - the MB version, not the MBP). The monitor is a 19" Iiyama, model PLE1900. I'm plugging in by DVI (DVI-D), using a Mini DisplayPort converter. The video on this laptop model is a NVIDIA GeForce 9400M.
When I plug in the monitor and turn it on, it just says "No Signal", but if I perform "Detect Displays" in the preferences, the monitor is detected, and even identified correctly.
So... I'm just stumped. Why would the lappy detect the display and then the monitor say "nothing here!"?
Is the problem due to DVI-D? The monitor also has a VGA (D-Sub) input, should I get a Mini DisplayPort adapter and try that? Obviously that an expense, so I'd rather not if I can help it.
Thanks for any replies.
Ben.

Ok,
It was neither the cable nor the computer (thanks Apple). It was the monitor's EDID profile. Dell's problem.
There's two ways to fix this. 1) It is possible (I did it) to create a custom profile using SwitchResX. You'll need to hook up your computer to the monitor using a working connexion (I used DVI) and then use the "export" function in SwitchResX. It will give you a text file. In it you'll have enough data to fill SwitchResX' form to setup a custom profile. You'll then need to restart the computer, hook it with the Displayport cable and try to use this custom EDID profile. It worked for me.
For example (and hoping it will help others) here are the data you need to setup a custom profile for the Dell 2408WFP :
Descriptor #0 - Timing definition:
Mode = 1920 x 1200 @ 59,950Hz
Pixel Clock............. 154,00 MHz Non-Interlaced
Horizontal Vertical
Active.................. 1920 pixels 1200 lines
Front Porch............. 48 pixels 3 lines
Sync Width.............. 32 pixels 6 lines
Back Porch.............. 80 pixels 26 lines
Blanking................ 160 pixels 35 lines
Total................... 2080 pixels 1235 lines
Scan Rate............... 74,038 kHz 59,950 Hz
Image Size.............. 519 mm 324 mm
Border.................. 0 pixels 0 lines
Sync: Digital separate with
* Negative vertical polarity
* Positive horizontal polarity
2) Of course, you can call Dell and tell them about it. They are sending me a THIRD replacement monitor for this. Be prepared when you call them : I spoke with two representative (and among them a "senior technician") who DIDN'T know what was a Displayport. They even tried to sell me the idea that 640x480 is the native resolution for Displayport. It was hilarious. Really. I got them to look it up on Wikipedia.
Case solved. Apple 1 - Dell 0.
P.

HP Phoenix computer can't detect second monitor

HI,
I have used this for a while (18 months) on one monitor and wanted to extend the desktop to a second monitor - but the system fails to detect a second monitor when it is plugged in.
It has an AMD Radeon 6850 with two DVi slots - both monitors work as I can swap them over. But neither the auto detect (HP Catalyst) or the manual detectoption show up a second monitor.
I have updated the ADM driver, restarted etc etc........ not sure what else to try. Any suggestions?
thanks
Mike

Hi MikeJeffries,
I'm sorry to hear about your problem in connecting a second monitor. Here is an article, (assuming you have Windows 8), that may be of help to you: Using Two or More Monitors with One Computer (Windows 8). Let me know if this helps at all. Best of luck to you.
Ryan1216
I work on behalf of HP
The advice and opinions given here are my own and not those of HP

MSI ATI radeon can't detect 2nd monitor

the monitor is on & working but neither Windows Hardware or the ccc detect it.
here's what I have-
Dell inspiron 530 w/ intel core(2) duo procssor 4Gb ram @ 2.20GHz
Windows Vista Home Premium sp2
MSI ATI Radeon 6450
Belkins f3006-01 vga splitter
monitors are 2 similar Gateway vga/dvi monitors.
all I want to do is extend the screen or slide pop-up windows to the 2nd screen for digital audio recording software(DAW). NO GAMING.

A closer reading of the safire 7950 Mac edition site (link above) says they want to see a Mac Pro 4,1 2009 or better.
System Requirements
Mac Pro with Mac OS X 10.7.5
CD-ROM or DVD-ROM drive for installing software
Mac Pro with Mac OS X 10.8.2 or later
2 GB RAM, Early 2009 Mac Pro (MacPro4,1)

Which Mac's (current) can support two independant monitors?

I am trying to figure out which Mac's (current) can support two independent monitors? I am assuming that a MacBook Pro can only have one with its screen being open. This would make it handle two, but not independent. In clamshell mode would it be able to have two? I want to know if I have two identical monitors which Mac can display on both to have the screens show desktop 1 and desktop 2. Thanks

Depending on what Macbook Pro you have, you can have at least 1 external monitor, and with the newer ones you can have up to 2 external montiors.
The most recent models need a miniDisplay port adaptor for your generic monitor. You can get miniDisplay port to VGA, DVI, HDMI adaptors from Apple, or some 3rd parties, such a MonoPrice.com and other vendors.
Have you ever seen this dongle? Is it someting apple sells? Thanks
<http://store.apple.com/us/browse/home/shop_accessories/all_accessories/cables_do cks#!>
I own a mini-DisplayPort to DVI/HDMI adaptor from MonoPrice.com. I also own a mini-DisplayPort to DVI adaptor.
Apple sells them as well
To be clear, the Mac Thunderbolt ports accept a mini-DisplayPort adaptor.
You can use 2 Apple Thunderbolt 27" monitors on a recent Macbook Pro using a Thunderbolt cable to the first one, and then using another cable from the 1st Thunderbolt monitor to the 2nd Thunderbolt monitor.
I am unsure about whether you can do the 2 monitor trick with non-Apple monitors, or if you can mix and match a Thunderbolt display with a non-Apple monitor.
Old Macbook Pros may have had a DVI connector, or a mini graphic connector, depending on how old your Macbook Pro is.

Can I connect multiple monitors to a MBP MD102?

I have a Mid-2012 13 inch Macbook Pro MD102. I have one external monitor connected through the mini display port but I have three more monitors laying around the house I would like to put to use. I tried connecting them through USB adaptors but the performance was extremely slow and didn't work correctly. Is there a solution where I can use my Macbook with more than just this one monitor? Thanks for your help.

Yes, but how depends on what model of Mini and what kind of monitors. Early models only had one monitor port. Later models had a Mini-DVI port and a Mini-Displayport. Current models have a Mini-Displayport and a HDMI port. The Mini-DVI and Mini-Displayport can attach VGA or DVI monitors, whereas the HDMI port can't use VGA monitors.
Beyond that, you can get Matrox's DualHead2Go or a USB->VGA or USB->DVI adapter. The Matrox product is a bit expensive and the USB adapters are a bit to slow for games and such. So, again, the answer is "yes", but with limitations

Can I connect two monitors to a Mac Mini?

Can I connect two Monitors to a mac mini

Yes, but how depends on what model of Mini and what kind of monitors. Early models only had one monitor port. Later models had a Mini-DVI port and a Mini-Displayport. Current models have a Mini-Displayport and a HDMI port. The Mini-DVI and Mini-Displayport can attach VGA or DVI monitors, whereas the HDMI port can't use VGA monitors.
Beyond that, you can get Matrox's DualHead2Go or a USB->VGA or USB->DVI adapter. The Matrox product is a bit expensive and the USB adapters are a bit to slow for games and such. So, again, the answer is "yes", but with limitations

Can the last link in a thunderbolt daisy-chain be a non-thunderbolt monitor using miniDisplay port?

Can the last link in a thunderbolt daisy-chain be a non-thunderbolt monitor, using miniDisplay port?
For example, Mac mini <--> external SSD <--> apple cinema display 30" (using miniDisplay port adaptor plugged into the SSD's second thunderbolt port)

TechnoMax wrote:
for instance STAE122 or STAE 127?
FWIW, STAE129 is the current version TB adapter
that is self powered and has TB daisy chain port.
STAE122 and STAE127 are older versions and
not the current model, though there may be stock of
these around. As to whether this will solve your issue,
I don't know.
Can I trick the Mac under Bootcamp as OS to use HDMI for the monitor? Dell officially says that the monitor can only accept 1900x1080 over HDMI, but some have fiddled wth different computers with custom settings that worked with some Monitors but mostly under Linux and to Dell 2711.
The MacMini HDMI port is hardware limited to 1980x1200.

HT3382 What if I want to connect the minidisplay port of a mac book air with the minidisplay port of a monitor? Can I use a the thunderbolt cable to do this connections?

Using mac book air (late 2010) minidisplay port and minidisplay port of monitor Monitor Dell UltraSharp de 23.8" Widescreen U2414H.
Can I connect them using a thunderbolt cable or is there a specific cable I can use to stablish this connection?
Thanks

A Thunderbolt cable won't work. Use a Mini DisplayPort to Mini DisplayPort, or Mini DisplayPort to DisplayPort, cable.
<http://www.monoprice.com/Category?c_id=102&cp_id=10246>
(If you use DisplayPort, make sure you use the Input, not Output, port on the display.)

Mac Pro 2008 with Radeon 4870 video useable resolution on DVI limited to size of minidisplay port VGA when displays are mirrored. Did not have this problem until I plugged in new monitor (miniDisplayport), but now it affects even going back original mon

Have been using the Mac Pro since 2008. Changed to a Radeon 4870 card early this year. Everything was fine.
Running an old KDS monitor from minidisplay port to VGA and a 1400x1050 projector from DVI out. Have used the
two mirrored the entire time with no trouble.
The old kDS monitor looked like it was starting to go bad so I got another monitor. Don't have much room
so it's a 14inchwith widescreen 1328x768 display. Hooked that to minidisplay port as it only has a VGA input.
Immediately the LCD display took over and restricted the output to the projector.
If I turn off mirroring, I can get projector back to normal. But this makes running programs a lot more difficult.
It worked fine with mirroring on before the monitor change. Except going back to old monitor,
now it is affecting things. I pull up display preferences. If the displays are mirrored, even setting the projector
to 1400x1050, it says "usuable resolution 1280x1024." It didn't use to do this at all.
Tried reseting NVRAM - no result.
Any suggestions would be helpful. Just looking at the image on the projector, I don't see any difference from
before.

UPDATE:
As noted in the first post, both of these newer USB DAC work fine at 24/96 on my wife's iMac, so it's clear that they didn't both become defective when I connected them to the Macbook Pro at the same time.
Resetting the Macbook Pro PRAM didn't help, so I removed the hard shell laptop case to get to the battery and remove it, then reset the SMC. After that I could use the original DAC at 24/96 again, but only IF it was plugged into the rear USB port. If I plugged it into the front USB port then the sound was garbled and filled with noise. This was a vast improvement over no sound at all.
Then I switched to the replacement/updated DAC, but I got no sound at all from either USB port at any bit-rate. And returning to the original DAC again now results in no sound again.
Sigh... I will reset the PRAM and SMC again, and see how far I can get with this. I'd still love some help. Thanks!

ATI 5870 can't play from minidisplay port

Hi
mac pro 12 core, ATI 5870, 12 core - 2,66 ghz, 8 gb ram, sata Tempo e2p card to 2 lacie disks. Bought on sept 2010.
In many occasions I cannot use mini displayport of the mac pro with my two hp 24" (they offer different output: displayport, dvi, hdmi). I cannot use hdmi port too with a minisplay port - hdmi converter (maybe this could be for the resolution?). If the Ati card cannot read the minidisplay adapter so it is impossible to use two monitor!
I had to write "in many occasions" because sometimes the connections works.
Until this morning this configuration worked: for the first monitor a dvi cable to dvi port of the 5870, and for the second monitor a displayport cable with a mini displayport adapter to one of the two minidisplay port on the 5870. This last monitor now remain black, letting the other one going well. If I turn off this monitor the other one become active in single monitor mode. Otherwise it behave like a second monitor.
Is this a 5870 problem? Or.... How can I solve it immediately??? Help please.
SOrry but for me it is difficult to explain this frustrating situation in english but I need a big help now.
Thank you and bye
Claudio

To drive 3 monitors you need 2 Dual Link DVI to MiniDisplay Adapters.

Minidisplay port can't detect a monitor

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