My imac does not start and asks for bootdisk

i bought a new imac and connected it with internet to upgrade the drivers. Power went off... and now imac does not start.
When it starts it asks for the boot disk and no boot disk came up with my mac.
Please help how can i reinstall mac.
thanks

None of the options work. I press the power on button keeping the option and R button pressed but the only option that appears is
First blank white screen appears as soon as i power on (option R is pressed) and then the following message
No bootable Device -- Insert boot disk and press any key
(Ethernet cable is connected but it does not go for internet recovery either)
No more activity.
Also if you can guide from where I can download OS X Lion for reinstalling it to the imac, please.
Does every mac come with a restore/bootable disk or not? We ordered two macs but did not get any disk with any of them.
Anxiously waiting for help....

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==> What I have already done:
1) I tried with the tigger dvd to reinstall. It didn't succeed.
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The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
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If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
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If a desktop Mac hangs at a plain gray screen with a movable cursor, the keyboard may not be recognized. Press and hold the button on the side of an Apple wireless keyboard to make it discoverable. If need be, replace or recharge the batteries. If you're using a USB keyboard connected to a hub, connect it to a built-in port.
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If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
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Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
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Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
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If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

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