No image on screen using Mini DisplayPort to VGA Adapter

Received mini today. After unboxing, read through the packet. Then began to hook everything up as directed. I used a Mini DisplayPort to VGA Adapter to connect the monitor from our now dead desktop to the mini. After double checking all connections, I hit the power button. I immediately heard the apple chime. Then the monitor showed the grey apple start up screen. Suddenly the monitor went black and said it was going into sleep mode. I can't get it out of sleep mode when connected to the mini. It is NOT the monitor or the adapter. I plugged the monitor straight into a netbook and it worked. Then, I plugged the monitor using the adapter into my MacBook Pro and also got it to work that way. So I tried replugging the adapter into the mini. Still can't get an image on the screen. I can't complete set up or use mini because I can't get an image. Any suggestions or ideas? I will call apple in the morning if I can't figure it out tonight. But I'm hoping someone can give me suggestions. Thanks for your help!

I had the same issue when I bought my mac mini last week apart from I wasn't even getting the initial grey screen. I went back to the Apple shop and they gave me another mini and fired it up in the shop using the adaptor on an old VGA monitor. It worked perfectly.
When I got home I set it all up again and still had the same issue. I nearly threw out a couple of monitors as I thought they were broken.
However, had a look around the web and found this suggestion:
Shut down the mac and disconnect the adaptor from it. Now fire the mac up and let it boot up FULLY. Once it has had a chance to boot up fully, only then plug the adaptor in.
Worked for me and I haven't had the issue since (touch wood). Hope this helps.

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Hi glraczon.support,
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Mini DisplayPort–to–VGA adapter implicated
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At this point, I would expect to be able to wake up the MacBook Air by tapping on the space bar of the keyboard. However, what I have observed is that this does not wake the MacBook Air.
I can wake the MacBook however by moving or clicking a Bluetooth mouse that is paired with the MacBook Air.
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After unplugging and plugging in again the USB keyboard (at which point the USB keyboard worked fine).
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Keyboard Hub@fe110000 <class IOUSBHubDevice, id 0x1000378ef, !registered, !matched, inactive, busy 3 (37993 ms), retain 6>
AppleUSBHub <class AppleUSBHub, id 0x1000378f2, !registered, !matched, inactive, busy 1 (37987 ms), retain 6>
IOUSBInterface@0 <class IOUSBInterface, id 0x1000378f4, !registered, !matched, inactive, busy 1 (37986 ms), retain 6>
Keyboard Hub@fe110000 <class IOUSBHubDevice, id 0x1000378f6, registered, matched, active, busy 0 (7 ms), retain 10>
AppleUSBHub <class AppleUSBHub, id 0x1000378f9, registered, matched, active, busy 0 (1 ms), retain 9>
IOUSBInterface@0 <class IOUSBInterface, id 0x1000378fb, !registered, !matched, active, busy 0, retain 7>
Apple Keyboard@fe112000 <class IOUSBDevice, id 0x1000378fd, registered, matched, active, busy 0 (112 ms), retain 11>
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Hi glraczon.support,
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Thanks,
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I am sorry for the confusion. The reason I asked about the speaker bar is that I can't find any information that shows built-in speakers on your monitor. I have looked everywhere, including in the HP specifications.
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Figure 2: Back I/O panel
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Signature:
HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
HP 10 Plus; Android-Kit Kat; 1.0 GHz Allwinner A31 ARM Cortex A7 Quad Core Processor ; 2GB RAM Memory Long: 2 GB DDR3L SDRAM (1600MHz); 16GB disable eMMC 16GB v4.51
HP Omen; i7-4710QH; 8 GB memory; 256 GB San Disk SSD; Win 8.1
HP Photosmart 7520 AIO
++++++++++++++++++
**Click the Thumbs Up+ to say 'Thanks' and the 'Accept as Solution' if I have solved your problem.**
Intelligence is God given; Wisdom is the sum of our mistakes!
I am not an HP employee.

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Mini DisplayPort to VGA Adapter NOT DISPLAYING ON EXTERNAL SCREEN

Hello!
Mid 2012 MacBook Pro
Processor 2.9 GHz Intel Core i7
Memory 8 GB 1600 MHz DDR3
Graphics Intel HD Graphics 4000
Software OS X 10.9.3 (13D65)
I have a mid 2012 MacBook Pro, I have connected a Mini DisplayPort to VGA Adapter in order to watch movies on a HP w19e LCD display.
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The display showed up without distortion.
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3) Restart computer. ...and it works like a charm.
I followed the directions and it worked... but after I restar to go back to um.. normal mode, the problem is back.
Please I need my LCD screen how can I fix this.
I hope I didn't confuse anyone, sorry for my english
THANK YOU
I leave the link for the Apple Forum
https://discussions.apple.com/message/18816392#18816392

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Found the fix. Still don't know if it was Windows, iTunes, or Norton 360, but this worked immediately for me:
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edgravel
Re: iTunes Store Won't Load, Won't Show Error Message
Aug 13, 2011 4:32 PM (in response to Daedalme)
I found a solution posted from Rodfromnework for PC users. It worked for me and easy to do.
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Thank you for the confirmation, Mr. Peck.

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What do I need to do to use the iMac as a monitor form my HP laptop? I have my laptop connected to the Mini DisplayPort to VGA adapter which is plugged into a Thunderbolt port.

vga may not be a compatible port
https://discussions.apple.com/thread/2246912?start=0&tstart=0
more hits
https://www.google.dk/search?source=ig&hl=da&rlz=1G1TSEH_ENDK367&q=use+imac+as+m onitor+for+pc&oq=use+imac+as+mon&gs_l=igoogle.3.0.0l10.2417776.2420497.0.2421354 .15.11.0.2.2.0.316.1723.0j4j3j1.8.0...0.0...1ac.-OkFwmTKBg0

No image on screen using Mini DisplayPort to VGA Adapter

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