Free upgrade to Yosemite from 10.6.8 - FAILED

I've spent the last few hours trying to upgrade my iMac to Yosemite 10.10.2 (from 10.6.8), which I believe was do-able.
URK - that's HOURS I'm never getting back - all for NOTHING - it FAILED TWICE.
What is going on?

When I upgraded to Yosemite this past weekend, on both my MacBook and iMac, I thought the upgrade failed because after an hour or so, all I got was a white screen with a thermometer half way - then everything stopped. I waited for over an hour on the MacBook (which I upgraded first).
I was scared, and I was planning a trip to the Apple store. But I decided to force quit the MacBook by pressing and holding the power button. After it turned off, I waited a minute, then pressed the power button. It booted right up. I figure maybe a neutron lost its way and Yosemite just wasn't able to reboot my Mac. But I can see why some users would think the upgrade failed.
So, I am wondering if this same situation happened to you, one in which the upgrade just stops AFTER it has been processed and is supposed to but doesn't startup.
I upgraded 10.6.8-->Mavericks (6 months ago)-->Yosemite (this weekend). I don't know, but it seems to me you should be able to install directly to Yosemite from 10.6.8. Just wondering, but maybe you could try upgrading to Mavericks, then to Yosemite.
As for your two hours of lost time you will never get back, well... welcome to the club. For some reason, you are in a minority of Apple users, as I have been, who have experiemced great frustration. As they say - there are two types of computer user, those that have been frustrated, and those who will be frustrated.
Calm down, take it one step at a time. Answer the questions asked by those in the preceding posts. They will then help you.

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Boot camp lost after upgrading to Yosemite from mountain lion

I lost my windows7 boot camp after I upgrade to Yosemite from mountain lion. When I press ALT when rebooting there is no more alternative to boot for window anymore. I did read some thread about this but my case is different since when I tried to type 3 steps(diskutil.......etc) as LonerT user answers it did not work. The attached files here are what I faced with. Please help. I have a lot of important files in windows

If you look at the GAP between GPT3 and GPT4 it is start/size of 782929176/37595880 but the NTFS header starts at 782929920 according to your Testdisk output shown here.
MS Data                782929920 976773112 193843193
The difference is 782929920 - 782929176 = 744 bytes. You will need to delete the current GPT4 and recreate a new GPT4. Please stop if you see any error messages and post here.
1. Delete the old entry and create a new entry at GPT#4.
sudo gdisk /dev/disk0
p
d
4
n
4
782929920
976773112
0700
p
w
y
Here is an example of the delete/new...
Command (? for help): d
Partition number (1-4): 4
Command (? for help): n
Partition number (4-128, default 4): 4
First sector (34-1954210086, default = 1454210080) or {+-}size{KMGTP}: 1454211072
Last sector (1454211072-1954210086, default = 1954210086) or {+-}size{KMGTP}: 1954209791
Current type is 'Apple HFS/HFS+'
Hex code or GUID (L to show codes, Enter = AF00): 0700
Changed type of partition to 'Microsoft basic data'
Command (? for help): p
Disk /dev/disk0: 1954210120 sectors, 931.8 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 6ED0C429-00D1-4759-B50E-04B6FB80D0E3
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 1954210086
Partitions will be aligned on 8-sector boundaries
Total free space is 1293 sectors (646.5 KiB)
Number Start (sector)    End (sector) Size       Code Name
   1              40          409639   200.0 MiB   EF00 EFI System Partition
   2          409640      1452940543   692.6 GiB   AF00 Customer
   3      1452940544      1454210079   619.9 MiB   AB00 Recovery HD
   4      1454211072      1954209791   238.4 GiB   0700 Microsoft basic data
2. This is a tedious process and you want to check after the second 'p'rint command that it looks reasonable, before the 'w'rite and 'y'es to confirm.
3. You will need to reboot after the change, because the disk you are booted from is the one being modified. Reboot will rebuild disk0s4 using the start/end you entered.
4. Run the dd command - sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C and check that the first line contains "R.NTFS".
5. Once you have a working GPT#4, a new hybrid MBR needs to be created which will overwrite what you see in your Fdisk output. This is also done using GPT Fdisk (Gdisk). Your numbers will look different than what are in the following example. In most cases, you will use the default except entry 4, which should have a 'y' for bootable flag.
sudo gdisk /dev/disk0
GPT fdisk (gdisk) version 0.8.10
Warning: Devices opened with shared lock will not have their
partition table automatically reloaded!
Partition table scan:
MBR: hybrid
BSD: not present
APM: not present
GPT: present
Found valid GPT with hybrid MBR; using GPT.
Command (? for help): p
Disk /dev/disk0: 490234752 sectors, 233.8 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 59BDFEEB-1EB4-4529-94FE-3CBC2C3CD513
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 490234718
Partitions will be aligned on 8-sector boundaries
Total free space is 2604 sectors (1.3 MiB)
Number Start (sector)    End (sector) Size       Code Name
   1              40          409639   200.0 MiB   EF00 EF
   2          409640       401060383   191.0 GiB   AF05 Macintosh HD
   3       401060384       402329919   619.9 MiB   AB00 Re
   4       402331648       490233848   41.9 GiB    0700 Microsoft basic data
Command (? for help): r
Recovery/transformation command (? for help): h
WARNING! Hybrid MBRs are flaky and dangerous! If you decide not to use one,
just hit the Enter key at the below prompt and your MBR partition table will
be untouched.
Type from one to three GPT partition numbers, separated by spaces, to be
added to the hybrid MBR, in sequence: 2 3 4
Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): y
Creating entry for GPT partition #2 (MBR partition #2)
Enter an MBR hex code (default AF): AF
Set the bootable flag? (Y/N): n
Creating entry for GPT partition #3 (MBR partition #3)
Enter an MBR hex code (default AB): AB
Set the bootable flag? (Y/N): n
Creating entry for GPT partition #4 (MBR partition #4)
Enter an MBR hex code (default 07): 07
Set the bootable flag? (Y/N): y
Recovery/transformation command (? for help): w
Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!
Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/disk0.
Warning: Devices opened with shared lock will not have their
partition table automatically reloaded!
Warning: The kernel may continue to use old or deleted partitions.
You should reboot or remove the drive.
The operation has completed successfully.
6. a. Test 1 - Can you see your Bootcamp volume in Finder.
    b. Test 2 - Can you files in the Bootcamp volume?
    c. Test 3 - Can you see Bootcamp in your System Preferences -> Startup Disk.
    d. Test 4 - If Test 1-3 are successful, select Bootcamp and click on Restart. You may need Windows startup repair, if you see a hanging underline cursor at the top left corner of your screen. In most cases, it is not required.
Here is an example...
Command (? for help): d
Partition number (1-4): 4
Command (? for help): n
Partition number (4-128, default 4): 4
First sector (34-1954210086, default = 1454210080) or {+-}size{KMGTP}: 1454211072
Last sector (1454211072-1954210086, default = 1954210086) or {+-}size{KMGTP}: 1954209791
Current type is 'Apple HFS/HFS+'
Hex code or GUID (L to show codes, Enter = AF00): 0700
Changed type of partition to 'Microsoft basic data'
Command (? for help): p
Disk /dev/disk0: 1954210120 sectors, 931.8 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 6ED0C429-00D1-4759-B50E-04B6FB80D0E3
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 1954210086
Partitions will be aligned on 8-sector boundaries
Total free space is 1293 sectors (646.5 KiB)
Number Start (sector)    End (sector) Size       Code Name
   1              40          409639   200.0 MiB   EF00 EFI System Partition
   2          409640      1452940543   692.6 GiB   AF00 Customer
   3      1452940544      1454210079   619.9 MiB   AB00 Recovery HD
   4      1454211072      1954209791   238.4 GiB   0700 Microsoft basic data

My MacBook Air (13" Mid 2012) 1.8 GHz, i5, 4 GB 1600 MHz DDR3 becomes sluggish, particularly web browsing after upgrading to yosemite from mavericks

my MacBook Air (13" Mid 2012) 1.8 GHz, i5, 4 GB 1600 MHz DDR3 becomes sluggish, particularly web browsing after upgrading to yosemite from mavericks

Mine is exactly the same machine and is working with any kind of problems.
Try to see this:
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I upgraded to Yosemite from Snow Leopard and lost my address book. Is there any way to retrieve the information?

I upgraded to Yosemite from Snow Leopard and lost my address book. Is there any way to retrieve the information?

Transfer iTunes purchases by:
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Copy music from Ipod to new computer...: Apple Support Communities
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Do you recommend i upgrade to yosemite from mavericks

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HI
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Is it possible to retrieve word documents from my imac after upgrading with yosemite from a 10.8 to a 10.10?

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LibreOffice
OpenOffice
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Hi,
I have Adobe Creative Suite 3 Design Premium and am thinking about upgrading to CS4 when it comes out.
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Dear Bob,
I have a difficulty to understand what you are writing.
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Matt

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Thanks,
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Do you have your Mac backed up?
If not, you should use Time Machine to back up your Mac to an external hard drive just "in case".
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Can I upgrade to Yosemite from snow leopard 10.6.8

I've been downloading Yosemite for over 2 hours and I'm wondering if this is normal and if so how much longer it might take?

And try not to double post: https://discussions.apple.com/message/27596659#27596659

Free upgrade to Yosemite from 10.6.8 - FAILED

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