Can't boot back to OS X

Hey there,
I recently installed windows 7 (32 bit) as I needed a windows build for a class I am in. I am using a 13" Macbook Pro, Core 2 Duo, early 2010 model. Unfortunately, I am unable to boot back to OS X. I have tried putting the OS X utility disk, for some reason when I hold down "C" while booting up, the only options I get are for Windows. I can't find the OS X partition. When I go into disk manager through Windows 7 I am able to see the partition for OS X but I cannot get the computer to boot from this. I need to repair this desparately as most all of my work is on the OS X build. I have a full backup so I can restore rather easily but at this point I can't even get to the OS X environment. If anybody has any suggestions, I would greatly appreciate it. Thank you kindly.

Did you try holding down the option key while booting with the OS X disc inserted? Something similar recently happened to me with Win7 32 and that was how I was finally able to boot from the disc. From there you can try to repair things with Disc Utility or at the very least restore your backup. Best of luck!

Similar Messages

Black Screen following install, can't boot back into Lion

Hi all,
I just tried to install Windows 7 Ultimate 64 via Bootcamp on my Late 2010 iMac (21").
Following installation (it completed installation fine) right before the part where the dialogue says 'Setting up your computer for the first time', the screen goes black and nothing appears to be happening.
I cannot boot back into Lion by holding Alt- it does nothing.
Holding C to boot from disk keeps brigning me to the same Windows Error Recovery screen where I am prompted to 'Start Windows Normally' or in the various Safe Modes.
Trying to start it normally results in this hanging black screen, trying to start it in safe mode results in a dialogue saying 'Setup cannot be completed in Safe Mode' and restarts the computer.
Obviously this is quite a tricky situation, I'd appreciate any help to make some part of my Mac usable again,
Thanks in advance for any input.
tl;dr:
Can't boot into Lion
Any action available to me in Windows results in the same loop of black screen hanging.
I'm not even sure where I can go to try and change any settings...

Reboot, hold the option key down when you hear the chime, release it when the boot manager appears. Select OSX as the startup. Once started go to Apple>System Preferences>Startup Disk and make OSX the permanent choice until you get the Winjunk running, even better, remove the Winjunk partition and stay in the light.
You might find it useful to read this, all kinds of basic information regarding OSX, no need to not know what to do next.

Can't boot back into OSX after installing windows 8.1

I have a late 2013 MacBook pro 15 inch with retina display.
After I got windows 8.1 up and running with a disk copy I tried to go back to the mac os side, but after I held down option/alt after restarting and clicked on the osx partition but all that happened was a white "no sign" showed on the screen and my computer began to boot back into windows.
I don't know if all my mac stuff is gone, so should I try and use osx recovery?

Try this first. Do a backup. Boot to the Recovery Volume (command - R on a restart or hold down the option/alt key during a restart and select Recovery Volume). Run Disk Utility Verify/Repair and Repair Permissions until you get no errors. Then re-install the OS.
OS X Recovery
OS X Recovery (2)

[SOLVED] Can't boot back into windows

Been a while since I had to install Arch but my previous PC died so I tried installing it on my new one. When I installed it last time, there was no EUFI and it was a simple Grub installation. When I installed it, I disabled eufi from my bios to legacy grub. I installed Arch like normal but os-probe didn't seem to work. Although it detected my OS, it did not make an entry for windows in the grub, When I re-enable EUFI from bios, it just goes straight to GRUB cmd line.
Here's the output for fdisk:
Disk /dev/sda: 946.4 GiB, 1016218828800 bytes, 1984802400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: A3D81761-F777-4399-9F81-01E346CDC93F
Device Start End Size Type
/dev/sda1 2048 1988607 970M BIOS boot partition
/dev/sda2 1988608 3708927 840M Windows recovery environment
/dev/sda3 3708928 4241407 260M EFI System
/dev/sda4 4241408 4503551 128M Microsoft reserved
/dev/sda5 4503552 1123987926 533.8G Microsoft basic data
/dev/sda6 1905238016 1953523711 23G Windows recovery environment
/dev/sda7 1953525168 1984798127 14.9G unknown
/dev/sda8 1123989504 1900040191 370.1G Linux filesystem
/dev/sda9 1900040192 1905238015 2.5G Linux swap
and os-prober
$ sudo os-prober
No volume groups found
/dev/sda3:Windows 8 (loader):Windows:chain
Arch is installed on sda8/sda9 and wndows is on sda3/4/5/6. There also seems to be a seperate "boot" drive sdb that only shows up when eufi is enabled. Can anyone help me figure out how to boot into my windows partition? thanks
edit: here's grub.cfg
# DO NOT EDIT THIS FILE
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
### BEGIN /etc/grub.d/00_header ###
insmod part_gpt
insmod part_msdos
if [ -s $prefix/grubenv ]; then
load_env
fi
if [ "${next_entry}" ] ; then
set default="${next_entry}"
set next_entry=
save_env next_entry
set boot_once=true
else
set default="0"
fi
if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
else
menuentry_id_option=""
fi
export menuentry_id_option
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi
function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
function load_video {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
else
insmod efi_gop
insmod efi_uga
insmod ieee1275_fb
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
fi
if [ x$feature_default_font_path = xy ] ; then
font=unicode
else
insmod part_gpt
insmod ext2
set root='hd0,gpt8'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt8 --hint-efi=hd0,gpt8 --hint-baremetal=ahci0,gpt8 6a6f6015-3793-4978-8c19-5abd44c63aea
else
search --no-floppy --fs-uuid --set=root 6a6f6015-3793-4978-8c19-5abd44c63aea
fi
font="/usr/share/grub/unicode.pf2"
fi
if loadfont $font ; then
set gfxmode=auto
load_video
insmod gfxterm
set locale_dir=$prefix/locale
set lang=en_US
insmod gettext
fi
terminal_input console
terminal_output gfxterm
if [ x$feature_timeout_style = xy ] ; then
set timeout_style=menu
set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
set timeout=5
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/10_archlinux ###
menuentry "Arch Linux pkg-linux kernel" --class arch-linux --class arch --class gnu-linux --class gnu --class os {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
fi
set gfxpayload=keep
insmod ext2
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt8 --hint-efi=hd0,gpt8 --hint-baremetal=ahci0,gpt8 6a6f6015-3793-4978-8c19-5abd44c63aea
else
search --no-floppy --fs-uuid --set=root 6a6f6015-3793-4978-8c19-5abd44c63aea
fi
echo 'Loading Arch Linux pkg-linux kernel ...'
linux /boot/vmlinuz-linux root=UUID=6a6f6015-3793-4978-8c19-5abd44c63aea rw
echo 'Loading Arch Linux pkg-linux kernel initramfs ...'
initrd /boot/initramfs-linux.img
menuentry "Arch Linux pkg-linux kernel (fallback initramfs)" --class arch-linux --class arch --class gnu-linux --class gnu --class os {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
fi
set gfxpayload=keep
insmod ext2
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt8 --hint-efi=hd0,gpt8 --hint-baremetal=ahci0,gpt8 6a6f6015-3793-4978-8c19-5abd44c63aea
else
search --no-floppy --fs-uuid --set=root 6a6f6015-3793-4978-8c19-5abd44c63aea
fi
echo 'Loading Arch Linux pkg-linux kernel ...'
linux /boot/vmlinuz-linux root=UUID=6a6f6015-3793-4978-8c19-5abd44c63aea rw
echo 'Loading Arch Linux pkg-linux kernel fallback initramfs ...'
initrd /boot/initramfs-linux-fallback.img
### END /etc/grub.d/10_archlinux ###
### BEGIN /etc/grub.d/10_linux ###
menuentry 'Arch Linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-6a6f6015-3793-4978-8c19-5abd44c63aea' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod ext2
set root='hd0,gpt8'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt8 --hint-efi=hd0,gpt8 --hint-baremetal=ahci0,gpt8 6a6f6015-3793-4978-8c19-5abd44c63aea
else
search --no-floppy --fs-uuid --set=root 6a6f6015-3793-4978-8c19-5abd44c63aea
fi
echo 'Loading Linux linux ...'
linux /boot/vmlinuz-linux root=UUID=6a6f6015-3793-4978-8c19-5abd44c63aea rw
echo 'Loading initial ramdisk ...'
initrd /boot/initramfs-linux.img
submenu 'Advanced options for Arch Linux' $menuentry_id_option 'gnulinux-advanced-6a6f6015-3793-4978-8c19-5abd44c63aea' {
menuentry 'Arch Linux, with Linux linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-advanced-6a6f6015-3793-4978-8c19-5abd44c63aea' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod ext2
set root='hd0,gpt8'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt8 --hint-efi=hd0,gpt8 --hint-baremetal=ahci0,gpt8 6a6f6015-3793-4978-8c19-5abd44c63aea
else
search --no-floppy --fs-uuid --set=root 6a6f6015-3793-4978-8c19-5abd44c63aea
fi
echo 'Loading Linux linux ...'
linux /boot/vmlinuz-linux root=UUID=6a6f6015-3793-4978-8c19-5abd44c63aea rw
echo 'Loading initial ramdisk ...'
initrd /boot/initramfs-linux.img
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###
### BEGIN /etc/grub.d/41_custom ###
if [ -f ${config_directory}/custom.cfg ]; then
source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
### BEGIN /etc/grub.d/60_memtest86+ ###
if [ "${grub_platform}" == "pc" ]; then
menuentry "Memory Tester (memtest86+)" --class memtest86 --class gnu --class tool {
search --fs-uuid --no-floppy --set=root --hint-bios=hd0,gpt8 --hint-efi=hd0,gpt8 --hint-baremetal=ahci0,gpt8 6a6f6015-3793-4978-8c19-5abd44c63aea
linux16 /boot/memtest86+/memtest.bin
fi
### END /etc/grub.d/60_memtest86+ ###
Last edited by giok13 (2014-04-24 15:20:31)

dice wrote:
As you have disabled UEFI during arch installation your grub was installed in mbr mode and not EFI.
Your Windows installation is probably installed in UEFI mode.
So when you enable UEFI grub doesn't work correctly. And in legacy mode Windows won't boot.
See here for details https://wiki.archlinux.org/index.php/UEFI
Yea, I figured it out last night after spending hours on it. For anyone that might be having the same problem as me: Re-installed grub with os-prober and it detected windows successfully. Added the entry into grub correctly as well. But when I tried to boot into windows, it said my bcd was corrupted. Apparently when I was trying everything, I formatted the entire /boot partition so there was no way for windows to boot. After hours of trying to figure out how to restore the partition, I went into bios and re-enabled UEFI, safe boot, fast boot. It restored the /boot partition and let me get into windows. Then disabled safe boot and fast boot, booted arch live cd and installed gummiboot.

Can't boot back to OS X from Windows 8 with Bootcamp

Today I booted to Windows 8.1 using Bootcamp. It was going great until I tried to go back to OS X. Apple's instructions said to just search for Boot Camp in Settings and do it like that, but it didn't show up in the results. I looked for a while, and I couldn't find it anywhere. Fortunately, I could still get back to OS X by holding option when I restart, which is a nice workaround, but I'd still like to figure out why it isn't working the way it's supposed to. Any ideas?

hold down option key during bootup and choose if you want to boot into osx or windows

Can't boot into Mac OS after Windows install via Bootcamp

Hello.
Last night I installed Windows 7 on my Macbook Pro early 2011 via Bootcamp.After some major complications I was able to finally install Windows 7 and boot into it. Now I can't boot back into my "Macintosh HD" partition, it shows a no entry sign.
Hard Disk : 320GB Internal Sata
Partitions : 3 -> Mac, Bootcamp and 10.8 Recovery Partition
The good part is that I can still access the Mac OS partition in Windows and Windows is working perfectly fine. As a matter of fact right now I'm on the bootcamped windows.
I have a full time machine backup but still I am looking for a way to solve this without formatting the HDD.
Things I have tried:
1. Resetting NVRAM and PRAM
2. Booting into 10.8 recovery partition and running DU.
SMART Status : Verified
"Macintosh HD" grayed and Not Mounted
Successful Verify Permissions (Twice)
Is there a way to solve this? Though the Mountain Lion partition shows when I press the Alt/option key on startup but I can't somehow boot into it.
Thanks

Your problem is OS X is refusing to boot.
There is still a bootable volume on the Macintosh HD partition, it's just not working.
You can #8 Reinstall Just OS X while command r booted from the Recovery partition, as long as you don't use Disk Utility to erase the Macintosh HD partition, your files and programs remain.
Hook the computer via Ethernet cable to a router (or modem, power reset required) with a fast relaible internet connection, you will need your AppleID and password to reinstall OS X.
Step by Step to fix your Mac

[SOLVED] Can not boot after mishap with clonezilla

Hi
I was trying to back up my computer with Clonezilla. It kept telling me that the drive I was trying to back up (the only hard drive in my laptop and only has Arch Linux installed on it) had a GPT and MBR partition table. I thought that this was odd so booted back into Arch Linux and loaded up gparted and it said that the drive was MBR. So I ran clonezilla again and it said about a command to run to remove the GPT if you are sure that you are using MBR so I went ahead (stupidly) and ran it thinking that everything would be ok and now I can not boot back into my Arch Linux. I just get a black screen with GRUB and a flashing cursor. I think the command that I ran was either:
gdisk -z /dev/sda
or
sdisk -z /dev/sda
I'm not too sure and I should have written it down or researched it first. (That will teach me.) I have booted the computer from a Knoppix DVD and can see all the partitions on the drive (root, swap and home) and also read all the data. I have tried to reinstall grub (install-grub /dev/sda deom the Arch install cd) but this has not worked. I hope that as will most things Linux I can fix this. Please can you point me in direction I need to go to fix this?
Thanks
Robert
Last edited by toca180 (2012-02-25 17:20:11)

Hi
I have fixed it. I ran testdisk from Knoppix and let it write out the partition table again as MBR then reinstalled grub from the Arch Linux install CD by doing the following from with in grub:
root (hd0,0)
setup (hd0)
Lesson learnt. I'll read and research before just blindly running commands again. Thank you all for reading.
Thanks
Robert

HT4818 hey, I want to install windows on my mac, I have mac osx lion and I'm soon going to get mountain lion. If I use Boot camp to install windows do I need a windows disc, will i lose all my data, etc. If so how to I save them. Can I switch back to osx

hey, I want to install windows on my mac, I have mac osx lion and I'm soon going to get mountain lion. If I use Boot camp to install windows do I need a windows disc, will i lose all my data, etc. If so how to I save them. Can I switch back to osx after I install windows. ( can I switch between Windows and OS X as many times as I want.) thanks for answering.
Sebastian

hey, I want to install windows on my mac, I have mac osx lion and I'm soon going to get mountain lion. If I use Boot camp to install windows do I need a windows disc, will i lose all my data, etc. If so how to I save them. Can I switch back to osx after I install windows. ( can I switch between Windows and OS X as many times as I want.) thanks for answering.
Sebastian

Disk repair failed how can I back up my files when I can't boot from the start up disk

When disk repair fails, and I can't boot from the hard drive how can I get to my files to back them up. I have a seagate 1 TB connected to the USB port.

Perubbit,
which model MacBook Pro do you have, and which version of OS X is installed on it?

Mountain lion on Mac Pro...after boot camp can't get back into OS x!!!!

Hey all,
Not sure what is going on?!?!? I sucessfully set up windows on bay 3 of my mac pro following the Apple documentaion....success! However, when I go and try to boot back into OS X, I can't. All I get is the chime, then a white screen and pause. If I let go of any of the key combos (see below), it boots right back into windows.
List of things I can't do on boot are :
- hold shift and go into safe mode
- hold Command + R and go into recovery mode
- hold alt and look for boot drived
The only thing that I have succesfully done is gone into target disk mode and checked the drives on my macbook pro. They seem fine in disk utility.
Please help! I don't want to be doomed to life with only windows 7 on my mac pro.
Much thanks
D

As an ammendment, on my macbook pro, I have succesfully mounted my MAC PRO boot drive (mac pro is in target disk mode). Everything looks fine. So summary is...
-Can't use any of the options to force a log in to my mac pro.
-I can mount my mac pro boot drive to my macbook pro and boot it there
-allways defaults to windows.
Any knowledge (even obvious) is much appreciated.

I can not boot my MacBook Pro. How do I get and save the data that is not backed up??

I can not boot my MacBook Pro running on Lion 10.7.4. I pressed control, comment P and R keys and O got to the disk utility, then I tried to repair disk and it can not be repaired. I get a message that tells me to back up as much data as possible ?. But if I can not open the computer how can I save my data??
I have a back up until 2 weeks ago on time machine. but the work of the last 2 weeks is extremely important how can I get it??
If I use m time machine backup do I loose the additional data of the last two weeks!,
Please help.. It's a huge amount of work that I have done and can not loose it

If it were me, I'd get a new hard drive or SSD and put it in an external enclosure. Boot into the recovery partition, format the new drive (not the old one) and install the OS to it. Shut down the Mac, open it up, and swap the drives. You may be able to read your data from the old one externally if you're lucky. If you're very lucky you may be able to use Migration Assistant to move all your stuff to the new drive.
Look at ifixit.com for the exact procedure to get to the drive on your model. If it's a unibody it's pretty simple.
http://www.amazon.com/Sabrent-2-5-Inch-Aluminum-Enclosure-EC-TB4P/dp/B005EIGUD4/ ref=sr_1_3?ie=UTF8&qid=1392154588&sr=8-3&keywords=2.5+enclosure

I took the system file out of the system folder on os 9.2 can't boot to put file back in machine also has osx 10.2 but won't let me boot to either need os 9 compatible boot disk I think?

I took the system file out of the system folder on os 9.2 can't boot to put file back in machine also has osx 10.2 but won't let me boot to either need os 9 compatible boot disk I think?

If the OS X 10.2 on the hard drive is/was bootable, try this -
Restart or boot, then immediately press the X key, keep it held down until you know the machine has started to boot using OS X. This is a hardware instruction to the Mac to boot using the first usable instance of OS X it finds.
Once booted to OS X, you should be able to move OS 9's System file into OS 9's System Folder.
Note - in general, unless you know for sure what you are doing and that the results are desired, do not relocate or rename files in OS 9's System Folder or in OS X's System or Library folders.

Can't get back into os x after os 9 boot.

I've never booted into os 9 on my old imac g3, so I decided to try it. After i selected os 9 as the startup disk and restarted, it showed up as a floppy disk with a question mark installed. I guessed something isn't installed right. I don't really care about os 9 now, i'm just trying to get back into os 10.4 tiger. I've tried holding the option key during restart, and it only shows a refresh button, macintosh hd in the middle, and an arrow pointing toward the right. The refresh doesn't do anything, and the arrow takes me back to the floppy disk with the question mark. Can anybody help me boot back into os x??? Thanks.
-Aaron

Sometimes you can call Apple and get replacemebt disks reasonably with your Serial# handy!
Tough without a Tiger Disk, but try fsck...
To use fsck, you must run it from the command line. Unlike using your mouse to open an application to do something, you'll need to type a text command at the prompt (#) to tell fsck what to do. The Terminal application (/Applications/Utilities) and single-user mode are two examples of command-line interfaces in which you can type such commands. To use fsck:
1. Start up your computer in single-user mode to reach the command line. Hold CMD+s keys down at bootup. Note: If necessary, perform a forced restart as described in the Emergency Troubleshooting Handbook that came with your computer. On desktop computers, you can do this by pressing the reset/interrupt button (if there is one) or holding down the power button for several seconds. On portable computers, simultaneously press the Command-Control-power keys. If your portable computer doesn't restart with this method, you may need to reset the Power Manager.
2. At the command-line prompt, type /sbin/fsck -fy
3. Press Return. fsck will go through five "phases" and then return information about your disk's use and fragmentation. Once it finishes, it'll display this message if no issue is found: ** The volume (nameofvolume) appears to be OK  If fsck found issues and has altered, repaired, or fixed anything, it will display this message: *** FILE SYSTEM WAS MODIFIED ***   Important: If this message appears, repeat the fsck command you typed in step 2 until fsck tells you that your volume appears to be OK (first-pass repairs may uncover additional issues, so this is a normal thing to do).
4. When fsck reports that your volume is OK, type reboot at the prompt and then press Return.
http://docs.info.apple.com/article.html?artnum=106214
Then Safe Boot , (holding Shift key down at bootup), off the HD & use Disk Utility from there to Repair Permissions, reboot once more.

I installed Windows 8 Consumer Preview and after that I cannot run OS Lion. How can I recover options to boot back in OS Lion?

I tried to reboot from CD or USB and the Mac Mini simply bypasses it to Windows 8 Consumer Preview.
How can I avoid to Windows 8 boot and have the options to select OS Lion?
I used Boot Camp as shown in many videos. I did not select any additional OSX drivers for install.
Thanks,
Marcio

I am stuck in Windows 8. I cannot boot back to LION. HELP!!! I am in Microsoft World again and no option to get back.
how can I install boot camp 4 in Windows 8 so I can reconfigure my computer back?

Can only boot into Windows 7. Can't even boot from Snow Leopard DVD.

I have no idea what prompted this. I don't recall installing any OS updates recently, other than some Windows Live apps in Windows 7.
I have an early 2009 Mac Mini with Snow Leopard, and have Windows 7 64-bit installed in a Boot Camp partition. When I installed Windows 7, I couldn't get the Boot Camp utility to install within Windows (I guess because it's 64-bit) so to switch back and forth between OSes, I just shut down the Mac and restart it with the Option key pressed, and select Mac OS X when I want to return to Mac. This has worked for about a month and a half now (ever since I got Windows 7). Suddenly I have problems.
I first had problems booting into Windows or Mac. I got to the grey screen with the Apple logo, with that spinning "progress" thing going for a while, then it would freeze up and get stuck on the grey screen with the Apple logo. I zapped the PRAM. No help. Then, after disconnecting all external drives (I have several) and extra USB devices, I was able to boot from the DVD install disk and reinstall Snow Leopard on my internal drive. Joy, or so I thought. Then I booted into Windows 7, and after some weirdness getting it to start, it did successfully start and ran just peachy.
Then I turned off the Mac and held down the option key (as usual) to return to Mac OS. But now all that happens is that I get a grey screen for a few seconds, then the Mac boots back into Windows 7, which seems to work fine. (I'm in Windows 7 right now.) I turned on one my external drives (Snow Leopard installed, connected via Firewire 800) in hopes that the Mac would boot into that, but same thing. Ignored and back to Windows 7.
Then I thought I'd boot from the install DVD again by putting it in the drive and holding down the C key as I restart, but the same thing--a grey screen for a few seconds, and then booting right into Windows 7. I can't seem to escape Windows 7! It's a bit disturbing when it won't even recognize the install DVD.
I tried to call Apple Care since I'm within my 90 day support window, but of course they are closed. I'm figuring that I'm going to have to take this into an Apple Store, but thought I'd see if anyone has any ideas. Any advice will be appreciated. Thanks.

According to Apple, Win 7 64bit is supported with Bootcamp 3.0. If bootcamp 3.0 is available; I could not find it anywhere on Apple's website. It appears the most recent version is 2.2. The only place I could find 3.0 is not on Apples website and it's a questionable source so I won't post it here.
It may just be a matter of time before Apple makes it available. I'm not suggesting you wait, however if the install disk can't be used, I'm not too sure where u could go from there. Calling Applecare might work.
If you do a simple google search using the terms 'download bootcamp drivers windows 7' u will see what I was referring too.
Here's what I found from Apple (It doesn't specifically mention 64bit however just win7): http://support.apple.com/kb/HT3920
This is not from Apple, but specifically addresses whether they support win7 64bit: http://www.macnn.com/articles/09/08/31/boot.camp.win.7.64.support/
Here is more info about bootcamp 3.0 and win7: http://www.apple.com/support/bootcamp/

Can't boot back to OS X

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