External monitor not being detected

I recently sent my macBook away for repairs, it was only software problems, the engineers it seemed simply uninstalled and reinstalled the software. Since I have had it back, I cannot get it to detect my Dell 2209WA. It was fine before. I am using a mini display port adapter with a cable (not sure what the cable is called). Nothing has changed, I have pulled out cables at each end, restarted macbook, detected displays, nothing. Any advice?

When I press a button on my monitor it says "there is no signal coming from your computer. Press any key on your keyboard or mouse to wake it up or press the input button on your display to switch to another source"
The display is currently on auto detect, have cycled through options, still not being picked up.

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USB buss and monitor not being detected

I've been having an issue this last week, where when I start up my Mac Pro does not output video. Judging by the hard disk sounds, it is booting up, but it doesn't detect the video. I think there is an issue with the USB bus, because if I remove all usb devices (including the keyboard) when it boots up it will send video to the monitor.
I've felt since I bought the computer that something hasn't been right with the usb system, it isn't entirely hot pluggable as it should be, and sometimes some peripherals seems to be competing for resources, i.e. if I hook up a phone to sync via USB my USB midi system will won't be detected. Since Snow Leopard these issues have gotten worse, but it could just be coincidence and be an underlying hardware failure that has chosen become worse.
The times when the monitor isn't being sent video, if I press any key on the keyboard it will make a clicking sound through the built-in speaker.
Anyone experience anything similar? I would run the hardware diagnostic utility, but because I need to hold down the 'd' key on the keyboard, and having anything plugged into USB prevents it from detecting the monitor I can't run it. Thanks.
Message was edited by: Eugene Scalisi

Hello Eugene,
Interesting - possible - coincidence. I just posted about a similar seeming issue here:
<http://discussions.apple.com/thread.jspa?messageID=10425731#10425731>
Notice that I've checked Disk Utility's repairs report as well as the System Log with Console: both show mention of USB related items.
This may not have anything to do with your issue but I thought it worth mentioning.

External projector not being detected when running Leopard

We have recently upgraded a number of our instructor laptops to Leopard. Since the upgrade, we have confirmed an odd problem.
We have a number of multimedia carts in classrooms. The carts use an Extron VSW2 splitter to supply video to a ceiling mounted NEC LT280 projector. One input on the Extron device gets video from a CPU in the cart, the second input is for the laptop.
We have tested identical computers (2 - PowerBook G4 12" laptops, and 2 - MacBook Pro 15" laptops). In each case, one laptop is running OS 10.4.11, the other 10.5.1.
The computers running 10.4.11 detect the the projector and mirror the display. The computers running 10.5.1 will not detect the projector. The computers running 10.5.1 blank the screen when the video cable is attached, but nothing is displayed through the projector. System Profiler reports under 'Hardware -> Graphics/Displays -> Display Connector:' No Display Connected.
If I bypass the VGA splitter (plug the laptops into the VGA port at the wall plate which goes to the projector), both the 10.4 and 10.5 computers function perfectly.
If I do not have a desktop connected to the VGA splitter, both the 10.4 and 10.5 laptops seem to work fine.
I have contacted the vendor that installed the units – Extron has never heard of this problem.
Right now this issue is affecting several instructors, but later in the term, as students need to give presentations, this will turn into a major impediment.
My speculation (unfounded, at this point) is that Leopard may be reducing the signal/voltage being delivered to the video port; the result being that there is not enough signal to trigger the switchover in Extron device.
Any guidance or direction would be greatly appreciated.

I think that Extron has an loop through on Input 1 for a monitor. You're probably using it for the CPU on the cart. Try running the Macs into Input 1 instead of Input 2. You may get it to work. The proj output on Extron stuff is usually buffered so that the projector doesn't pass info back to the computer. If you go into input 1, the computer will "see" the monitor and output properly.
Maybe.
Mind you, that doesn't help a whole lot 'cause you need the monitor for the CPU, right?

External Monitor Not Working With Macbook Pro

My computer was working fine with an external monitor, then my computer froze, and I had to hold down the power button. When I turned it back on, my computer would not work with an external monitor. I've tried different cables, so it's not the cable. The monitor is being detected by the computer, but nothing is showen on the external monitor. When connecting the monitor to the computer, the computer's screen goes blue, then turns back to normal. I
I cannot reset the SMC by removing the battery, I do not have the confidence to remove my battery, and do not have the time to send the computer to someone else to do it.
I also tried updating my OS from 10.7.4 (Might've been 10.7.3) to 10.7.5.
My computer is a MacBook Pro (13-inch, Mid 2010), running OS X 10.7.5 Lion.
I need to get this problem fixed ASAP, any help is appreciated.
Kind Regards,
Sergee237

I forgot to mention, I'm connecting the monitor via MiniDisplay -> HDMI. I've also tried USB -> HDMI and USB -> DVI -> HDMI but none of them seem to work.

Mac os partition not being detected

I was using samsung hdd in my mac that was bootcamp partitioned. later I replaced the hard drive with the other HDD. Now i am using samsung hdd as external drive and wanna format it but the mac OS partition is not being detected how do I format the whole drive??? I can only see the windows partiton which is 150gb rest 350gb was Mac OS partition which i wanna format but not able to do....please help

Ok, you took out drive #1 which had Lion, Lion Recovery Partition and Bootcamped Windows.
You installed drive #2 internally and installed the Lion Recovery Partition and Lion (via what method?)
You booted from drive #2 and hooked up your drive #1 using either a SATA to USB adapter or powered enclosure and only can see the bootcamped partition? not the previous Lion Recovery or Lion OS X partition.
Some enclosures don't work with OS X
However if you want to format the entire external drive, wiping off everything including OS X, Bootcamp and Windows, all your files and programs, you should be able to select the "size" "brand name" + "model number" + "media" of the actual hardware itself on the far left side in Disk Utility.
(In my case I have two OS X partitions)
If your just selecting the name of your OS X boot partition, like Macintosh HD, then your only formatting that partition not the entire drive.
Click the Partition tab, select 1 partition, Option GUID, format OS X Extended Journaled and click apply, the entire drive will then be formatted for Mac use only.
If you want PC/Mac use, then Option Master Boot Record, format exFAT for 4GB+ files, or FAT (MSDOS) for under 4GB sized files, but most compatibility with other devices and Windows XP machines.
My thread here explains how it all works.
https://discussions.apple.com/message/16276201#16276201

My Ipod Nano 5th generation is not being detected by Widows and Itunes. I have tried everything based on the trouble shooting tips outlined. Has anyone had this situation before? How was it resolved. My Ipod is just out of warrenty

Have done all trouble shooting tech a through Apples and still have not resolved issues on Windows and itunes not detecting my Ipod nano 5th generation device. Tried restoring the device manually using disk mode and still not being detected by the computer. Device is our of warenty as when service repair charges are $125.00 dolars more than I paid for this device. There must be some way to restore the entire device to factor settings without having to be connected to itunes and Windows. I wish I could connect but again device is not being read. I have another Ipod that is 8GB instaed of 16GB and it works fine. The sad thing about this situation is that my 9year old daughter worked hard doing delivering fliers for a long time to save her money to buy this 16 GB 5th generation Nano. Otherwise the Ipod works well but will not syncronize songs as it is not being detected. Maybe this is a result of corrupt files that got onto my daughters Ipod somehow and thus causing it not the be detwected through the USB connection thus as a result not be understoud as a working device through Windows and itunes. If anyone can help me out there including itune techs that would be well appreciated, but for now my daughter is not able to add new or delete any songs on her ipod as well pictures, and everything. Thanks

Try changing the cord. I could NOT get my computer to recognize my iPod 5th Gen until I read somewhere that different apple devices use different cords. I was inadvertently using my iPad cord and that caused my computer to not recognize my ipod.

Ipod 4g 32G not turning on, not charging (on multiple cords, both comp and wall, 4 20min), not being detected by Itunes or Windows 7 64bit OS, will not reset, tried taking it out of "DFU", NO DMG, Itunes up2date, All I'm getting is a blank black scrn

Ipod Touch 4th generation 32G not turning on, not charging.
I have used multiple cords on both computer USB and wall USB converters. I let it sit there for over 20 min with each attempt.
It is not being detected by Itunes or my Windows 7 64bit OS. I have tried all 4 of my USB ports (both USB 2.0 and 3.0), with 3 different chargers.
Holding home and power button will not reset.
Tried taking it out of "DFU" mode but Itunes won't detect it, I didn't think that would work anyway.
NO DAMAGE, I have been very careful with it, aside from a few minor scratches. (that you can't even see unless the light reflects them)
My Itunes is up to date, as is my OS.
All I'm getting is a blank black screen. It has been working fine on this computer before. I have no idea what could have happened. I'm at my wits end here.

See if you missed anything here:
- iOS: Not responding or does not turn on
- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
- Try another cable
- Try on another computer
- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
Apple Retail Store - Genius Bar

My iphone 4 is not being detected by any of my computers and not charging when connected to any computer. It will, however, charge to the car or wall. The only change that I can think of is that I downloaded a podcast from itunes directly from my phone.

My iphone 4 is not being detected by any of my computers and not charging when connected to any computer. It will, however, charge to the car or wall. The only change that I can think of is that I downloaded a podcast from itunes directly from my phone. I've since deleted this podcast with no luck. I've restarted both the phone and the computer, still no luck. One computer is running Vista and the other Windows 7, both have the latest Itunes Update. Anyone have a fix for this?

You clearly did not notice that you have joined a USER TO USER COMMUNITY FORUM
This is NOT Apple ,Apple do not read nor do they therefore respond
So if you would like to wind your neck in ........................
try a reset of iPhone and then a restore,best, as new and if it then functions correctly try restoring with your backup

Hp v235r flash drive not being detected on my computer

Hi,
I am using hp v235r flash drive for more than 5 years. It's not being detected on my computer since two days. Can any one solve my problem, as there is lot of important data stored in it and hasn't been backed up recently.

Hello budda48,
Its possible the driver for the pen drive is corrupted in your computer, or the drive has met its end of life.
First, confirm that the Pen Drive is seen by other computers. Plug it in to another computer that you havent tried yet.
If it is not working on other computers, then the usb drive is corrupted and there wont be anything else we can do.
If it is working in other computers, then try these steps to troubleshoot the Pen Drive.
Confirm that the port on the computer is not bad. Choose a different port to insert the drive. Next…
Part 1: Make sure that the drive has a drive letter assigned in Disk Management.
Open Computer Management by right clicking on Computer and clicking Manage.
Click on Disk Management. Give it a moment to open the view of the drives installed.
Look for a drive that does not have an assigned drive letter and is not labeled as System Reserved.
Note: System reserved drives are reserved by Windows and will not allow you to assign a letter.
Right-click the unlabeled drive and click Change drive letter and paths…
Click Add and then click OK to select the first available drive letter.
If the Change drive letter and paths… option is not available, make sure that the drive is Online.
If the drive is Offline, right-click the disk number and click Online.
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You can safely remove any usb drivers that are not in use (hidden drivers). Devices that get plugged in later will simply reinstall its needed driver again.
Remove the pen drive from the computer if it’s attached.
Right click Computer and click on Properties. In the System window on the left side, click on Advanced System Properties.
Choose the Advanced tab and click on Environment Variables… button at the bottom.
Under System Variables, click on the New… button
Type this in the box that pops up. Variable Name: devmgr_show_nonpresent_devices and also give the Variable Value: 1
Click OK on all the open windows to close them out.
Go to Computer Management again and click on Device Manager. Go to View at the top of the window and click on Show Hidden Devices.
Click on the drop down arrow for Universal Serial Bus Controllers to open the list. Look for any USB Mass Storage Device that is hidden (greyed out) and delete it. There may be several and it’s ok to delete all those hidden USB Mass Storage Devices.
When you connect the pen drive to the computer again, give it a minute to reinstall the driver.

My iPhone is not being detected on my laptop itunes. How do I get it to appear under devices?

My iPhone is not being detected on my laptop itunes. How do I get it to appear under devices?

iPhone, iPad, or iPod touch not appearing in iTunes

HT203128 My iPad is not being detected by iTunes after I updated to the latest version of iTunes. What should I do?

After updating to the new version of iTunes, my iPad 2 is not being detected when I tried to sync. Any solutions?

A few things to try. Any one or a combo mayhelp
Reset your iPad.
Hold down the sleep and home keys for about 20 seconds. Then plug it back in and see if it is seen now.
Try a different USB port
Reboot your computer
If you have a PC:
If that doesn't fix it, go into the control panel, add/remove programs. Uninstall iTunes, apple Mobile device service, apple application support.
Then redownload and reinstall iTunes. then try again.

My iPod touch 5th generation had white screened an it won't let me rest it by holding down the home button an the power button for ten seconds I've pulled it in to iTunes an its not being detected what can i do as its starting to over heat?

my iPod touch 5th generation had white screened an it won't let me rest it by holding down the home button an the power button for ten seconds I've pulled it in to iTunes an its not being detected what can i do as its starting to over heat?

If you can't get it to shut down or restart when holding down the Home and Sleep/Wake buttons and you can't get it recognized in iTunes to restore it, the iPod may have suffered a hardware failure and will need to go to Apple for service. Someone else here may have additional suggestions, though.
There is no "fifth generation" iPod touch, by the way, just for the sake of clarity; not yet, anyway.
Regards.

My iphone is not being detected by the itunes on my laptop with windows 8

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See iPhone, iPad, or iPod not recognized in iTunes for Windows - Apple Support
For general advice see Troubleshooting issues with iTunes for Windows updates.
The steps in the second box are a guide to removing everything related to iTunes and then rebuilding it which is often a good starting point unless the symptoms indicate a more specific approach. Review the other boxes and the list of support documents further down the page in case one of them applies.
The further information area has direct links to the current and recent builds in case you have problems downloading, need to revert to an older version or want to try the iTunes for Windows (64-bit - for older video cards) release as a workaround for installation or performance issues, or compatibility with QuickTime or third party software.
Your library should be unaffected by these steps but there are also links to backup and recovery advice should it be needed.
tt2

Iphone 4s not being detected by windows 8 laptop and itunes

Hey all,
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Hello Bethany2
Try creating a different user for your computer and open iTunes to see if shows up in that newly created user. The article below will home a few more troubleshooting steps, some of which you have already tried.
iOS: Device not recognized in iTunes for Windows
http://support.apple.com/kb/ts1538
Regards,
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External monitor not being detected

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