Startup trouble, won't update and says "operating system not found"

So when I tried updating to the new thunderbolt update thingy (yes I know, VERY late but I kept forgetting to update it and I didnt have time) it didnt start up because it said "operating system not found" after 30 mins of looking around for tips to reboot they didnt work,
I troed rebooting and it worked, and I followed the instructions to "download Mac OS X Lion" again. But it wont redownload because this reason:
"You can't upgrade this version of Mac OS X because a newer version is installed."
I have tried everything and since I downloaded the thunderbolt REALLY late I dont think anyone else had had this problem.
Help me please?

Hi, pimmerik.
Thank you for visiting Apple Support Communities.
Sorry to hear that you are experiencing this issue. I would go through the steps in the article I have included below as they may help resolve this error.
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/TS2570
Regards,
Jason H.

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Hey all first time post long time listener, got a t43 thinkpad that will not boot and gets the message,
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Welcome to the forum!
Posting the 7-character model number of the T43 in question would be a good start...
Downloading and burning a PC-Doctor disk and booting from it would be the next step:
http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-56222
Good luck and keep us posted.
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In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
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Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

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I've been following the beginners' guide and I keep running into this "Operation System not found" error.
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Last edited by soote (2013-08-31 20:36:12)

WonderWoofy wrote:This sounds not like a problem with Arch or your bootloader installation at all. Rather it sounds as though you need to make an adjustment to your bios to tell it to correctly try to boot the disk with syslinux on it.
Thank you for the advice. I followed the steps listed here, and ran everything except for the last command (# syslinux-install_update -i -m). On reboot I was still faced with the Operation system not found error. I then ran # syslinux-install_update -i -m and got the following:
Syslinux install successful
ABORT! MBR installation to partition (/dev/mapper/arch_root-image)!
I'm unsure of what this error means, but it lead me to this blog entry.
This blog looks promising.
roentgen wrote:
Same Dell here. It seems to be a compatibility problem between BIOS and GPT.
I couldn't find any other way than to use MBR.
How do you create the partition table? In fdisk 'o' is used to create a DOS (MBR) partition table.
I followed the beginners' guide to create it. I will try creating the partitions with o instead of p, i didn't know about that option. I really don't need a GPT partition.
Last edited by soote (2013-08-31 21:07:22)

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Welcome to the forum!
Posting the 7-character model number of the T43 in question would be a good start...
Downloading and burning a PC-Doctor disk and booting from it would be the next step:
http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-56222
Good luck and keep us posted.
Cheers,
George
In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

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