Get back to MAC OS from windows 7

I have only windows 7 on my macbook pro. and when I insert the DVD OS X installation, it wont boot and I hold down the option or C key, it won't boot.
Even I tried by a flash memory and restored it from OS X Installation and it booted, but when I selected it, stuck at same screen.
any one know how to fix it?

You don't need Mac OS, fine to have Windows 7 only.
I do that, and never said Mac OS was needed, only that the Apple device drivers, hardware abstraction, drivers to enable network, graphics and other things. And for that you need OS X DVD to get started to insert those into Windows - that is all.
Otherwise it is pretty easy, but you might want to trade in for ThinkPad or something else. Or invest $30.
YOU have to install drivers - I guess it may seem like more work. Or if the OS is all done and pre-installed for you.
http://labs.adobe.com/downloads/flashplayer10.html
http://www.microsoft.com/Security_Essentials/
http://www.mozilla.com/firefox/
http://www.beautyoftheweb.com/ - IE9 RC is nice
http://www.geeksmack.net/microsoft/796-7-things-to-do-after-installing-windows-7
http://www.apple.com/support/bootcamp/
http://support.apple.com/kb/HT3986
http://arstechnica.com/microsoft/news/2009/03/win-7-on-a-macbook.ars

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my mac book air can't start installation, because i use windows installation in DOS to make partion, now no mac os on it. How to get back the mac os? i have a window based iso image from a friend, because in my country there is no Apple service.

It sounds like you destroyed your boot partition and the recovery partition. Depending on it's age, your MacBook Air might be able to do a net boot. Plug and ethernet connection into it and attempt to boot. If it has the right firmware, it will find a net boot configuration on the net and boot that. Then it will give you a Recovery Partition like display and allow you to reinstall the OS X version that came with it.... assuming that it was Lion or ML. If your computer came with Snow Leopard, then even the net boot won't work.
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That doesn't sound good. It sounds like the power outage might have corrupted the partition for OS X. I would suggest booting from the Install DVD that came with your Mac while holding down the C key. Once you have selected the language start up Disk Utility from the pull down menu and repair the disk. Once you have done that then repair permissions also.
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I have used Bootcamp to install Windows 7 on my new Mac OS X Lion. Now when I start my computer it starts directly with Windows. How do I get back to Mac?

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Get back to Mac from Win 7

I'm not sure how I managed to do this but...
I deleted my VmareFusion partition with win7, and vmware fusion.
Then I upgraded to Lion.
Then...
I created a new partition using Bootcamp assistant and then re-installed Win7.
At some point, when I was away from the computer, it turned off.
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I am working away from home and do not have my snow leopard startup disk..
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I'm not really understanding what the end goal was. But in case anyone else comes across the thread, neither the built-in Windows volume resizing utility nor any 3rd party Windows resizing utility should be used to resize either the Windows partition or the Mac OS partition. Invariably they all manipulate the NTFS volume in such a way that the secondary GPT is corrupt, the primary GPT is rendered invalid, and only correctly alter the MBR. It's a recipe for data loss.
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Windows on Intel Macs
There are presently several alternatives for running Windows on Intel Macs.
1. Install the Apple Boot Camp software. Purchase Windows XP w/Service Pak2, Vista, or Windows 7. Follow instructions in the Boot Camp documentation on installation of Boot Camp, creating Driver CD, and installing Windows. Boot Camp enables you to boot the computer into OS X or Windows.
2. Parallels Desktop for Mac and Windows XP, Vista Business, Vista Ultimate, or Windows 7. Parallels is software virtualization that enables running Windows concurrently with OS X.
3. VM Fusionand Windows XP, Vista Business, Vista Ultimate, or Windows 7. VM Fusion is software virtualization that enables running Windows concurrently with OS X.
4. CrossOver which enables running many Windows applications without having to install Windows. The Windows applications can run concurrently with OS X.
5. VirtualBox is a new Open Source freeware virtual machine such as VM Fusion and Parallels that was developed by Solaris. It is not as fully developed for the Mac as Parallels and VM Fusion.
Note that Parallels and VM Fusion can also run other operating systems such as Linux, Unix, OS/2, Solaris, etc. There are performance differences between dual-boot systems and virtualization. The latter tend to be a little slower (not much) and do not provide the video performance of the dual-boot system. See MacTech.com's Virtualization Benchmarking for comparisons of Boot Camp, Parallels, and VM Fusion. Boot Camp is only available with Leopard or Snow Leopard. Except for Crossover and a couple of similar alternatives like DarWine you must have a valid installer disc for Windows.
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Get back to MAC OS from windows 7

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