Yosemite install, trim enabled, won't boot, can't erase hard drive

I recently upgraded to Yosemite, enabled FileVault and foolishly enabled TRIM (had no idea it wasn't supported).
Upon restart, my machine gets the grey screen with the crossed-out circle of death.
After figuring out what happened, I then attempted to restore from a Time Machine backup (10.9). The backup failed almost immediately, but did manage to erase the HD (or at least the partition is gone).
Now I'm completely stuck. Disk Utility can see this drive, but cannot erase or re-partition it. The drive isn't mounted so I cannot access it with Terminal (at least with my level of knowledge). cd /Volumes/mydrive doesn't work - no such directory.
I have re-installed Yosemite on my second hard drive and booted from there. I tried Disk Utility again and I still have no options available to erase or partition my original disk, although it is there.
Can anyone help me get my original disk back into functioning form? If I can just get the disk erased and partitioned, I can load my Time Machine backup and be off to the races. Thanks!

TRIM is on the software side. Therefore if you are going to erase the whole disk and do a clean install of Yosemite, TRIM will not be enabled. If i understand the mechanism of TRIM and OS X right, TRIM is usually only enabled when using an official Apple SSD (e.g. on the newer MacBooks).
Now lets go back to the issue with the erasing. If there is something wrong with the partition/the installation on it, i personally would download ubuntu and erase the SSD. "My HD" is your SSD, isn't it? There is a utility called "hdparm" which lets you erase SSDs quite fast and easily from a linux-terminal (usually it takes only seconds and there are only two lines of terminal-code needed). Unfortunately i couldn't find this tool for os x.
But maybe there is also a solution without using another distribution. Did you try to start the disk utility during the startup of your pc by holding "command + R" ?
Or you could try to create a usb stick with the Yosemite installation and access the disk utility from there. This would prevent the system to mount any partition and maybe let's you format the hard drive.
EDIT: I just found this article: http://apple.stackexchange.com/questions/6278/how-to-securely-erase-an-ssd-drive /6287#6287
What's the result, if you type "df -k" in your terminal? (it will only display the available space left on your hard disks etc.) There should be two entries for /dev/disk. One should be your "Boot"-Drive and the other should be the broken "My HD".

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Late 2012 Mac Mini. I cloned my 10.10.2 installation of Yosemite over from my Macbook pro 6,2 to a 1TB Samsung 840 SSD. It booted with no issues besides the keychain being lost and all passwords having to be re-entered.
After a week of going perfectly, it stops recognizing the USB keyboard after I unplugged it and plugged it back in. So I rebooted and get the dreaded stop sign after the boot failed. Oops. I enabled trim before I cloned, but forgot to check if it was working in the cloned drive (seems it was in the end). Since there was no recovery partition, I booted into Internet Recovery, but that hung using both WPA and WPA2 router logins. It obviously was syncing with router, but I got error -2002f in every configuration I tried. It also didn't seem to recognize an ethernet connection. Weird stuff.
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Fix The Bugs Please wrote:
It is unlikely to be a hardware failure as the Mac Mini was made in May 2014 and I bought factory refurbished. It seems to be an issue relating to the SSD as it boots other drives.
Any ideas?
Is this SSD an additional drive added to your Mac Mini or did you replace the HDD with it? If it's an additional drive and since it's a Samsung, depending where you purchased your drive doubler kit (iFixit or OWC) you can try swapping the drives in the bays. I know for a fact that Samsung SSDs do not work right with the iFixit drive doubler kit's SATA cable. But it does work correctly with the Apple supplied SATA cable. If it's the OWC SATA cable, I know for a fact those are much more reliable with Samsung, OWC, Intel, Crucial SSDs. Another thing, I would NOT enable TRIM (my opinion) using a 3rd party trim enabler if you're running Yosemite. There are issues with trim enablers and Yosemite. Just let the built-in Garbage Collection take care of things.
If it's not an additional drive that was added, does your Mac Mini boot and work fine with the stock drive that it came with? Even though it's a 2012 model, if you purchased it refurbished from Apple in May 2014, you're still under warranty (same 1yr as new Macs) and if it's having same or similar issues working with the stock drive, you can take it to a local Apple Store for warranty repair. You would need to have only the stock drive installed (no SSD) before you setup an appointment.

Mini won't boot up from internal hard drive

Greetings,
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Hmmm,
qErr
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Message was edited by: Hellstan

Mac won't boot up if external hard drive is on

I just purchased an external hard drive to use for my Time Machine backups. The "installation" instructions said that with the computer off, to power up the e.h.d., then power up the computer. Well, the computer is evidently trying to boot up from the e.h.d. - the white screen/apple logo sits there for 5 minutes, then it restarts but cycles through the same thing over & over. Called Apple Care & we simply turned the e.h.d. off and booted up just fine. Then turned the e.h.d. back on & my first Time Machine backup went fine.
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Thanks for responding.
Yes, I tried everything yesterday. It only allowed me to verify the disk and not do any repairs. This computer has some major issues so I am not surprised. Since it was destined for recycling anyway, I decided not to waste any more time on it, so I removed the hard disk instead and am about to ship it off.

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If you got it new in August 2013, there aren’t any disks. Restart it with the Command and R keys held down instead.
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(108993)

Can't erase hard drive in disk utilities

I want to erase the hard drive of a late 2007 Macbook with OS-X 10.7.5. Erase panel is mostly greyed out in disk utilities. I can highlight hard drive and root drive, but can't select format, name, security options, or erase. All of these are greyed out. Tried to access utilities through reboot with command + R, but still mostly greyed out.

OK. Do you have any bootable OS X disc - 10.5 or later? If you do, then boot from it if you can and use it to erase the drive. Before you do this please follow these instructions:
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Back up your data using Time Machine or other backup methods for OS X Mavericks or Mountain Lion.
If you use Find My Mac or other iCloud features on this Mac, complete these steps:
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Drive Partition and Format
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4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
Steps 4-6 are optional but should be used if you wish to do a security erase that will permanently prevent your data from being recovered.
If you can't find a disc to use then you need to spend $20 to buy a Snow Leopard DVD from Apple: You can purchase Snow Leopard through the Apple Store: Mac OS X 10.6 Snow Leopard - Apple Store (U.S.). The price is $19.99 plus tax. You will be sent physical media by mail after placing your order.
When you sell the computer be sure to include the Snow Leopard DVD for the next owner to use.

Help! X60 won't boot with new 320GB hard drive..

I'm trying to get a Seagate Momentus 7200.3 320GB SATA drive working with my 1706-M7M X60 thinkpad.
I've cloned my existing OEM Hitachi 80GB to the new drive using Acronis True Image. So far I've done this four times so I'm thinking the cloning is not the issue.
BIOS has been switched to Compatibility mode.
The odd thing is that the resuce and recovery partition works but not the bootable windows partition?
I can also see all the files on the new drive, both partitions are visible when it is plugged in via the USB enclosure. They look fine.
I've been trying to get it working for 3 days and I'm ready to throw the notebook out the window!
Thanks in advance.
Solved!
Go to Solution.

If you are willing, I would recommend that you use Easeus Disk Copy. It is a bootable CD that will clone the drive sector-to-sector.
\\ I do not respond to PM regarding individual tech support. Keep discussions in the forum for the benefit of others //

Can't erase hard drive and reinstall Snow Leopard (SuperDrive)..

Running OS X 10.6.8
2.13 GHz Intel 2
2 GB 1067 MHz DDR3
I have the original "gray discs" with Snow Leopard on them, and a SuperDrive. I would like to completely wipe the computer, and start over with just Snow Leopard. When I tried to do this yesterday following this tutorial, the whole process sort of froze at Part One, Step Three.
For the lazy non-link-clickers, here's the instructions I followed:
1. Turn on the computer.
2. Insert the Mac OS X Install DVD into the optical drive.
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Well, Kappy, you were right: my 2009 MBA came with Leopard, so those Snow Leopard gray discs I was using did not come with my machine.
Unfortunately, I was unable to find the Leopard gray discs that must have come with the computer.
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Sigh. What is the deal.

My MacBook Pro has 10.5.8 but came with 10.5.7 install disc and won't boot up and can't reinstall

My MacBook Pro has 10.5.8 but came with 10.5.7 install disc and won't boot up and can't reinstall.
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Welcome to the Apple community.
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Yosemite install, trim enabled, won't boot, can't erase hard drive

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