Mac OS no longer boots

I'm new to the forum and a new Mac user. My problems started when I attempted to install Win 7. After setting up the proper partition size under I selected installation startup. My MBP restarted and begun the installation. When it asked for which partition to select I picked the one called bootcamp and selected format. After the install went normal for a standard windows install and finished at the windows desktop. Since I needed from my understanding drivers for most of the hardware I restarted my MBP in an attempt to switch over to OSX. This is where all my problems begun. After holding down the option button to switch to OSX I didn't get a response nor from any of the other hotkeys I had attempted along with the eject button. Now all that happens when I turn on the computer is I hear the Mac power up sound and a grey screen that after a few switches over to loading windows. I have completely no idea as to how to fix my problem or even where to start. Any answers out there?

Normally 'we' ask someone to boot from their OS X DVD.
Some installers wipe out the EFI partition.
I thought the idea was to DELETE Boot Camp partition (advanced options) and CREATE NTFS. But it has been a long while and I use entire drives, dedicated to Windows (and another to OS X).
And of course BACKUP before beginning any such process as installing a new OS, partitioning your boot drive, etc.

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Click Here
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Wow...this is good to know! After many years with PCs I "assumed" that it would name the 1st drive "C" and then each one after that in order.
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Tony,
If I remember right from my boot camp / xp
installation, boot camp aliases the drives, and when
it tells you to format C: for windows, that's the one
to select from the screen.
I panicked when I saw that, but then I realized that
the C: drive shown on the installation screen was
actually my secondary drive (and that boot camp had
shuffled the drive letters around). If you notice,
C: is actually not the top of the list, and in my
case I had two different drive sizes and so I could
reason that C: matched my secondary drive's size.
In short, pick C: for installation, as the program
says...
I thought for sure it nuked my OSX installation at
first, when it didn't seem that I could boot back to
OSX, but in the Control Panel of Windows (or in your
System Properties on OSX) you'll see an icon called
"Startup Disk" which will also allow you to pick OSX
or Windows and then restart.
Mac Pro 2.66, 3 GB Mac OS X (10.4.8)

Mac OS no longer boots

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