Computer will not boot after 10.6.8 upgrade

Just did the 10.6.8 upgrade to a computer and not it wont boot. Stuck at the grey start up screen with the apple and the spinning wheel of death. Zapped the PRAM to no avail and reset the SMU and still the same. Any advice?

Reinstall OS X without erasing the drive
Do the following:
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install the Combo Updater for the version you prefer from support.apple.com/downloads/.

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White iMac will not boot after 10.6.8 upgrade

I downloaded the 10.6.8 upgrade last night. This morning, the white plastic iMac will not boot.
I have tried evey known keyboard option.
I have tried booting from the snow leopard dvd.
I have zapped the pram.
Nothing!
Please, any help would be great.

We bought 2 iMac's 27inch with i7 Quad-core. Did the update a couple of hours ago. My Mac asked to reboot after update, but i didn't accept and worked with iTunes for a while. Then rebooted manually. After reboot it took about 15 minutes to reboot (light-blue screen with nothing on it, not even a mouse). My Wife also did the update of 10.6.8 and rebooted when asked. Her iMac also took 15 minutes to reboot, bus update was unsuccesful! So did update again and then denied reboot and rebooted manually! (Apple-logo and then choose "restart").
When we did that, iMac was very fast and updateproblem was solved! So deny reboot and reboot manually and problems are over. Same deal with 2 brandnew iMac. I'm guessing this is an issue. To much of a coincidence for me!

Computer will not boot after changing RAM.

Hi All,
I have had some BSOD since I upgraded my system earlier in the year. So yesterday I decieded to try and test if the problem was one of the RAM blocks, by only using 1 X 4 MB ram at the time, and then after a BSOD I would change it to another RAM and test again.
Anyway, I started by taking all 4 X 4 MB ram's out, and then only insert 1 in Dimm 4(first found out later that I should have put it in Dimm 1). This worked fine, and computer rebooted, and I used it all yesterday. Then just before I went to bed I got another BSOD, so I powered the computer off, and then this morning before turning on the computer, I replaced the RAM with one of the other 4 MB ram, to continue the testing of my ram blocks.
But now my computer just wont boot anymore! I tried putting all RAM blocks back, putting 2 of them in, 1 at the time, and every combination I can think off, but it just wont start anymore.
When I power on the computer, it does start the fans, and the 2 blue light in the motherboard is on, but nothing comes on the computer screens, and no beeps or anything at all. It just stands there with all the fans running without booting bios.
I tried resetting the CMos, and removing the battery like shown in your guide on here, but it made no difference. I also tried to remove ALL ram blocks, just too see if it then would give me any beeps, but exact same thing happens. So I supect that the reason it does not start booting, is because it thinks that there is no RAM in the motherboard ???
I really hope someone can help me out here, since I'm close to giving up, and I'm out of ideas. Everything worked fine last night, but after switching the RAM block, it just wont boot anymore no matter what ram I put in it.
My system is:
MB: Z68A-GD80 (B3)
CPU: Intel Core-I7 2600K
RAM: 2 X 4 MB Corsair Vengence 1600 Mhz & 2 X Kingston Hyper-X Genesis 1600 mhz
GFX: HD 4870
Monitors: 2 X Asus vW246H
Please help! thanks in advance!

Quote from: Froggy Gremlin on 31-August-12, 18:25:21
This is almost always a recipe for failure and the most likely cause of the BSOD's. Recommend to pick one kit or the other to use, or better yet if 16GB is wanted, purchase a 4X4GB kit.
Check to see if the EPS/ATX 8-pin CPU power connection is secure. The PSU is not specified in your component list. It is possible it has gone bad. Test with only one RAM stick in the primary DIMM slot. I have the most trust in the Corsair brand.
Prior to the test, remove the PSU power cord, remove the battery for awhile, clear CMOS.
Hi, thanks for your reply.
I have been running with those different ram blocks for a long time, and the 2nd set I actually got after the BSOD's started to test the ram. The BSOD is very likely to be because of a bad Win 7 installation anyway, since I cloned my old HDD to a new SSD, and that is apperantly not a good way to go, so the lets just forget about the BSOD for now - that aint my main problem right now..
I did what you surgested above, eventhough I done it before. I now have just 1 corsair ram in DIMM 1.
Removed powercord, then I cleared the CMOS again by pressing the clear cmos botton at the back with a screwdriver for 10 secs. Then I removed the battery for 10+ secs as well.
Still does not seem to boot into bios. Fans running, and light on MB, so powersupply must be fine as well. Seems unlikely that it should just die overnight anyway.. Powersuppy is a Corsair HX 750.
CPU power conector is fine. I really haven't done anything except switching that RAM block this morning. Last night when I powered the computer down, everything worked fine.
To be sure that its not because my GFX card should have gone bad overnight, I tried with another GFX card, but still nothing comes on the screens when it should be booting up.
If the none of the RAM was working, or it does not detect any ram in the motherboard, shouldn't it atleast be giving some sort of error beeps ?? What is so frustrating is, that I get NO errors or sound or anything.. I just a black screen, and a computer with atleats all fans running..

Computer will not boot after bios update

This afternoon I recieved an urgent BIOS update in much the same format as I have received updates from HP for years. It was accompanied with some other non urgent update.
So I gave the permissions to make the update.
I recieved a notice that the update had been successfully completed and the computer said it was restarting.
The problem is that it never woke up...
After several minutes I manualy restarted the computer.
As the boot began I heard three beeps, and then nothing but a black screen.
I shut down and restarted after several minutes but this time no beeps just black screen.
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I began researching what the three beeps mean. Appearently three different sets of BOIS were used in this model. Different BIOS have different beeps.
Well I sure never thought I would need to write down what BOIS I have...
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Hello,
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Hi Arkku , and a warm welcome to the forums!
I'd certainly give Sig's advice a try first.
If that should fail...
applesetupdone...
This was Posted by: JoseAranda at September 9, 2006 3:48 AM
"OK, restart your computer, hold down Command-s and type in the following:
/sbin/fsck -fy Enter
/sbin/mount -uaw Enter
rm /var/db/.applesetupdone Enter
# The rm command is the remove command which deletes the file.
# Robert: I'd rename the file via: mv /var/db/.applesetupdone /var/db/.applesetupdone.old
reboot Enter
Once you've done that the computer reboots and it's like the first time you used the machine. Your old accounts are all safe. From there you just change all other account passwords in the account preferences!!
end of posted by: JoseAranda"
Reset OS X Password Without an OS X CD...
http://theappleblog.com/2008/06/22/reset-os-x-password-without-an-os-x-cd/

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Welcome to the HP Forums!
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Please click the "Kudos, Thumbs Up" at the bottom of this post if you want to say "Thanks" for helping!
Please click "Accept as Solution" if you feel my post solved your issue, it will help others find the solution.
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try to make shour that the ram is snug and in all th way make shour NOT to jam them in and dont leve a empty slot in betwen them if there craced be shore not to use the in any in the computer check the mother bords slots and the pins on the ram and make shour that theres no dust stuck in there . thats all i can think of hope it works out for u. :^)

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Computer will not boot after 10.6.8 upgrade

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