When I turn on my iMac, it shows a black screen and says 'No bootable device - enter boot cd and press any key'. Not sure how to fix this.

When I turn on my iMac, it shows a black screen and says 'No bootable device - enter boot cd and press any key'.
I'm not sure what to do, I did not recieve a cd with my mac to boot it up (I ordered it online).
Also I can't find my harware serial number (I've tried many times to input what I thought it may be from my receipt). I saw that I need this number to contact apple support, my 90 day complimentary support is still valid so I wish to contact them.
I don't know much about apple products as this is my first apple computer so any information is helpful.

Hold down the Alt/Option-key at startup of your iMac to get the Boot Selection screen.
From that choose to boot into OSX.
Once in OSX go to System Preferences then Startup Volume and reset your OSX to be the default.
The new iMacs have OSX 10.7 Lion preinstalled and don't come with any CD/DVD anymore.
Instead OSX Lion includes a new feature called "Lion Recovery".
Have a read here About Lion Recovery
Stefan

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I registered my new iPhone 5s to my usual Apple ID, however it isn't showing in my devices when I log in. I tried to register it by adding a new device, but it tells me it's already registered to a different Apple ID. I'm really not sure how to fix this.

I registered my new iPhone 5s to my usual Apple ID, however it isn't showing in my devices when I log in. I tried to register it by adding a new device, but it tells me it's already registered to a different Apple ID. I'm really not sure how to fix this. I only have the one Apple ID and the phone is brand new, purchased directly from Apple.
When I check on the phone itself (iCloud and App Store settings) the Apple ID is correct. I'm not sure where else to check.
Whilst setting up the phone, it prompted me to register, which I did. Then when connecting to my laptop through iTunes it prompted me again so I registered again. I even got a confirmation email to the email address associated with my Apple ID that the registration was successful.
How can I add my iPhone 5s to the list of devices on the correct Apple ID?
Thanks in advance for any advice.

Found the answer to my question after posting (in related discussions)
https://discussions.apple.com/message/12331666#12331666
Will call Apple Care as soon as I can.

How do i quit bootcamp when it say "No bootable device -- insert boot disk and press any key"

Hi,
How do i quit bootcamp when it say
"No bootable device -- insert boot disk and press any key"
cuz i resraart my imac and the nextday i went to use my imac i just say mi that.
Can you please help mi out ?

Reboot holding down the Option key between the tone and the apple logo w/pinwheel. When the boot manager gives you a selection of boot partitions, choose your Lion partition. Once booted, go to System Preferences > Startup Disk > select your Lion partition.
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Try:
https://discussions.apple.com/thread/3415227?start=0&tstart=0
https://discussions.apple.com/message/16400530#16400530

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Hi jodilynnf,
When using Connection Doctor to see what is could be causing the issue, look for the red dots to let you know what is wrong. Then all you have to do is correct that information. You can double click on the section that is giving you issue and it will take you there. Most issues could be just password being entered incorrectly. Take a look at the article below to walk you through troubleshooting issues with Mail.
OS X Mail: Troubleshooting sending and receiving email messages
http://support.apple.com/en-us/TS3276
Take it easy,
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Installing Windows 7 on iMac via external superdrive resultes in "No bootable device-insert boot disck an dpress any key".

I previously had Windows 7 on my Mac, but removed it after returning from deployment because it had a virus that I could not remove. The only way to remove was to insert a CD/DVD with the anti-virus on, but in my absence, the optical drive was not cleaned and did not work. I had only been using partition for college, so I removed it.
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iMessages only, not all texts as in SMS/MMS.
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My iMac won't boot....Msg says "NO BOOTABLE DEVICE--INSERT BOOT DISK ...
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If I understand correctly and you're having trouble accessing the iTunes Store in iOS 7 on your iPad, I would recommend this article of troubleshooting:
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http://support.apple.com/kb/HT1430
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When I turn on my iMac, it shows a black screen and says 'No bootable device - enter boot cd and press any key'. Not sure how to fix this.

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