Circle with slash/won't recognize DVD or external drives

I have this model:
Model Name:          MacBook Pro
Model Identifier:          MacBookPro5,5
Processor Name:          Intel Core 2 Duo
Processor Speed:          2.26 GHz
Number Of Processors:          1
Total Number Of Cores:          2
L2 Cache:          3 MB
Memory:          8 GB
Bus Speed:          1.07 GHz
Boot ROM Version:          MBP55.00AC.B03
SMC Version (system):          1.47f2
Serial Number (system):          7304001D66D
Hardware UUID:          134FD99D-DF06-5912-A8B9-255280C48DCC
It often fails to boot with the circle with slash. Tried safe boot (works), tried booting from optical drive with original system disc (won't recognize or eject-tried all of the eject techniques), and ran disk repair in target mode (found nothig wrong). Can't run hardware check for obvious reasons. It does not see external drives connected to FW or USB ports.I am starting to suspect a bad logic board. Any thoughts?

I can no longer startup from a CD/DVD
Be sure you're inserting the DVD that came with your Mac Pro. If you are trying to boot from other optical media be sure it is compatible with Intel Macs and specifically the Mac Pro. You are probably trying to boot off a discs that does not have a suitable OS on it.
or my external FW drive which has 10.4.8 also installed on it (pre-intel)
Same goes here. Your FireWire drive does not have a suitable OS installed in it. You need to install an Intel version of Mac OS X. Additionally you will probably need to repartition your drive using the GUID Partition Table. Until you do both of these Startup Disk will not let you select it.

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Won't recognize all my external drives.

Couple of years ago I built my pc with lots of help form this forum. One little issue I have always dealt with was my WD My Book external drives.
I'm using a GA-X58A-UD3R MOBO, i7 950 cpu. My hard drives show up like this...
Hard Disk Drives (7)
Local Disc (C)
My Book (J) - 1tb
Raid A (M) - 2tb
Raid B (N) - 2tb
Video Music Images (O) - 2tb
Back Up (P) - 1tb
WD Media Ctr (T) - an old 250g WD external drive
My problem is I have 2 WD My Book Drives and only one shows up. If I want to use the other My Book drive, I turn one off and turn the other on, then reboot.
How can I get both drives to show up so I can access either without the on/off, reboot thing?
Thanks,
Jay

Go to Disk Management > Storage and assign a drive letter to the drive not recognized. I have to do this whenever I have more than one of my WD My Book externals connected at the same time in Windows 7.

Why won't my quick Silver power mac boot up? Has a gray screen with white circle with slash thru it in the middle of screen!

Gray Screen with white circle with slash thru? Will not boot up! What can I do?
Please help!
Noel

The circle with slash means it cannot boot from the drive it thinks it's supposed to boot from.
Hold the Option/alt key at bootup, what shows as boot choices?
Will it boot from your OSX Install Disc?
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at the top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)

Cannot start up, get Grey circle with slash through it

My 12" gets hung up at grey start up screen, i have tried to reboot from 10.3 disk and holding option key, the screen then goes to a "not allowed" grey circle with slash through it. No clue what to do. HELP
thank you peter

Hello Again peter,
As I asked HERE,
Why are you using the "10.3 disk", and not the Full Retail Version, of the Tiger Install DVD?
As the computer specs, in your Above Post, re displayed as: G4 PowerBook 12" Mac OS X (10.4.4).
Here's an additional KB Article You see a blank, gray screen, to review.
ali b

Getting circle with slash at startup...

My computer started to get really slow one night so I decided to restart it, but then I ended up with the circle with slash error and couldn't now can't get past it. Here is what I have tried so far: Reset PRAM. Tried to "repair disc" using disc utilities, eneded up with an error (sorry, dont remember what the error was!). Had planned on re-installing the OS by erasing the hard drive, ended up with the follwing error "Disc erase failed. POSIX reports: The operation couldn't be completed. No such file or directory" Starting to think replacing the hard drive might be the easiest option, unless anyone knows what's going on?? Thanks!

((((((Were you doing this from the the DVD because that's the way to do it.))))))
Yes.
((((By now it sounds like you have written off the existing OS and want to reinstall it again. What problem are you having trying to do this?
Will it restart and allow you to boot into the DVD for you to reinstall?)))
Yep, it will allow me to boot from the dvd. I everything backed up on an external drive using time machine. When I tried to "restore system from back up" under "utilities" after inserting the DVD, there is a section where you select the disc where you want to restore your system to and my main hard drive isn't even showing up in the list...

After an firefox auto-update, there is a circle with slash over the icon (do not) and it will not launch.

Firefox was doing one of its automatic updates and it never finished but a circle with a slash through it appeared on the icon and now Firefox won't launch. It gives the following error message:
"The application "Firefox" cannot be launched. -10661"
I've tried re-downloading Firefox but when I get to the window where you move the Firefox icon to the folder it still shows that it has the circle with slash through it. It will start downloading then stop.

Firefox 4 requires at least OS X 10.5 and an Intel Mac. There is a third party version of Firefox 4 that runs on OS X 10.4/10.5 and PPC Macs, for details see http://www.floodgap.com/software/tenfourfox
If you prefer, you can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html
Mozilla are working to prevent Mac users with non-compatible systems from getting the notification about Firefox 4, and also not displaying the "Download Firefox 4" button on http://www.mozilla.com

Need Help with Boot up getting circle with slash on Dual 1 GZ MMD G4

Hi everone, I'm having a problem with my old Dual 1GZ MMD G4 booting up from the HD consistently. I had to replace the power supple very recently and after that I'm having trouble. I've even installed a 250 HD and completely reinstalled the OX back to Jeopard and sometime after it sits it will boot up just fine..... but after restart even holding down OPTION and it see's the HD it will not boot up ( just getting circle with slash) I've verifyed the HD and a repair permissions and all checks out ok! I've have two different HD's that check out ok with disk utility and I still get the same results.... GETTING VERY FRUSTRATED:(
Any help or ideas would be greatly appreciated! THANKS!
Scott F.

Thanks for your reply! After reading another post I found out what the issue was and I was about to give up......
The Dual processor board was not seated and after reseating it back to the main board it been all good! Theres really know way to tell by looking at it, just gave it a push and noticed it was not right. CRAZY after all the time playing with HD's it was that..... Like the post I read it happen after replacing the Power Supple and I guess it just moved a tiny bit out of place..... I hope this helps others and again thanks for your HELP!!!!

Couldn't get to the login scrn. Circle with slash symbol. S-mode not helpin

System: *PowerMac G4 DDR 1GHz with 1.25GB RAM and Tiger 10.4.10 (or .11 not sure)*
At first, I could not get the Mac to get to the login screen i.e. it boots up but the timer symbol thing (you know that clockwise 'loading' icon thingy) keeps cycling for hours (eventually I switched it off not to waste electricity).
Tried second time using OS X install disk and check + repair disk, then boot up - still the same symptoms. (NB. Looks like I can do the fresh install though but that is not my intention just now).
Then, did the reset PRAM thing (cmdalt+PR), second chime - folder/question mark (no startup disk screen), then it shows the circle with slash icon on screen, eventually shut it down.
In single user mode, it stops after the 'got bootdisk...' and no flashing of the keyboard cursor.
In verbose mode, almost the same as above.
+Have not changed the PRAM battery or reset PMU. Have been off the grid (off at socket for quite a long period but does not normally do this).+
+In single user mode, one of the line says clock is wrong or reset. After PRAM reset, one line says PMU was reset.+
My questions are:
1. What is that circle with slash icon mean? (can only find on Intel Mac pages - could not load boot.efi, or some other issue)
- ref: <http://support.apple.com/kb/HT2674>
2. Is installing a new system folder the only solution?
3. Do I need to get a new battery?
4. Is my startup hard disk at fault?
Thanks.
dean

Hi Dean,
Have been off the grid (off at socket for quite a long period but does not normally do this).
I'm pretty sure the battery is extremely dead if the computer has been off the grid. Remove the PRAM battery and see if it starts. A new battery is always a good place to begin. We've seen plenty of posters here say their MDD startup problems cleared up with the installation ofa new battery. I get my batteries here:
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/
I don't know your geographic location; if you are not in an area served by the above reseller, you can use the specs in that link to shop locally. Bottom line--you need to eliminate the battery as a suspect before proceeding with troubleshooting.
If a battery is over a year old I don't bother testing it. I've had too many PRAM batteries test 3.6V in my hand yet did not perform well enough under load to propelr work in teh computer.
Another easy thing to try is a Safe Boot. Info here:
http://support.apple.com/kb/HT1455
Be sure to give the computer time to get to a desktop--takes longer is safe mode.

Circle with Slash thru on startup

First time I have seen this symbol. Seems to have happened after waking my mini from sleep to find a pop up message that the iTunes movie rental I had downloaded had expired and was going to be removed from my iTunes Library. After hitting OK, I got crazy spinning rainbows, so I did a forced shutdown using the power button. Upon restart, I now get the grey Apple logo followed by the Circle with Slash icon. What now?

Try booting from another Mac via firewire target disc mode or booting from you original CDs and see if your harddrive checks out ok in Disk Utility

When I try to drag the iphoto library to the external disk a forbidden (circle with slash through it) icon appear. Why do you suppose it is preventing me from adding to external drive? These are pictures I have taken. I believe it cannot find the origina

When I try to drag the iphoto library to the external disk a forbidden (circle with slash through it) icon appear. Why do you suppose it is preventing me from adding to external drive? These are pictures I have taken. I believe it cannot find the original file. Please help.
Thanks.

What happens if you try to Option-drag the library to the EHD? The same icon?
Make sure the EHD is formatted Mac OS X Extended (journaled) with Ownership set to be ignored:
OT

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Did you install the latest driver set for the device? there is a new release on motu.com for mavericks.
rachel

IMac with Mavericks won't recognize new 60D

iMac with Mavericks won't recognize new 60D

No drivers are required on the Mac to use the camera. The Mac will natively recongize the camera.
You can install Canon's supplemental software or you can use the Apple provided software or 3rd party software.
However... when you connect a camera to a Mac and it recognizes the camera, you *can* configure what you want the computer to launch. By default, a Mac will usually launch iPhoto.
If you open iPhoto (do this EVEN if you don't want to use iPhoto) then go into iPhoto -> Preferences and look at the "General" category. You'll see an option that reads: "Connecting camera opens:" with a selection menu next to it. You can use that menu to pick what you want your Mac to do, then close and quite iPhoto.
When connecting the camera to the computer, do the following:
Turn the camera off
Use the supplied USB cord to attach the camera to the computer (some caveats here... I'll mention them below).
Power the camera on after it's attached.
About those caveats on step 2.
The reason I say "use the supplied USB cord" instead of use any USB cord is because if you're like me... you've got LOTS of USB cords laying around. Some of these come with devices that use USB for charging purposes. And some of those USB cables ONLY bother to wire the power supply pins and not the data transfer pins. In other words... it looks like a normal cable, but wont actually allow for data transfer. You will need to take care to make sure you're using a proper cable.
Next I should caveat the use of USB hubs. Whenever you're having a problem with a computer not recognizing a USB device, it's a good idea to disconnect extraneous USB devices that have nothing to do with your issue AND if there's a USB "hub" involved... bypass the hub and connect the camera directly to a USB port on the computer itself.
I use a USB hub and this particular hub is reliable... but truthfully I had to buy three different hubs before I found one that worked reliably. I've discovered there are a lot of flakey hubs on the market. When in doubt... bypass the hub. If you find that you can get your computer to recognize your camera on a consistent basis if you bypass the hub then you can direct your attention to finding a reliable hub.
That's the end of the caveats.
I wrote a response to a user with a similar issue in which I detail the steps to use the Mac's System Information utility to determine if the camera is showing up as connected to the camera. You can find that post here:
http://forums.usa.canon.com/t5/EOS-Rebel/My-Macbook-Pro-will-not-recognize-my-Canon-Rebel-T3i-when-I...
Tim Campbell
5D II, 5D III, 60Da

ITunes won't recognize media on external hard drive

Hello Everyone....
So I have a 17" Macbook Pro, that was recently repaired under Future Shop's PSP that I purchased. They wiped it completely clean, so I essentially have a brand new computer again.
Luckily, I put almost all of my data and media onto my external hard drive before it went in. I have been operating with my iTunes media stored on an external drive for some time now with success.
Now that my computer is completely new, I did all the available updates, and then went to link my library to my iTunes, as it's "new again". It doesn't have my library attached anymore. I think I forgot to save the actual library files that I'm now reading about, and instead just saved the actual mp4 files. To be honest I didn't know there were library files and actual media files, seems weird...
I've changed my preferences back to the external drive folder where my media is located, and I've clicked "consolidate files" and nothing happens.
I've tried to hit the "scan for media" button that pops up when you have a wiped or new computer and nothing has happened.
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I can't seem to find anything on the internet to assist with this particular issue. I have all my media stored properly in the iTunes media folder but no actual "library" file. I guess I didn't realize they existed!
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Preferences does not scan for media, it only changes the storage location for new additions. The files have to be added to the library. It sounds like you tried this in one of your attempts but it did not work (I don't know why it didn't unless there is some detail I missed).
Where do you want your library? On the external or internal?
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If somewhere else, start iTunes while holding down the option/alt key, select a library location. Add as above.
What are the iTunes library files? - http://support.apple.com/kb/HT1660
More on iTunes library files and what they do - http://en.wikipedia.org/wiki/ITunes#Media_management
What are all those iTunes files? - http://www.macworld.com/article/139974/2009/04/itunes_files.html
Where are my iTunes files located? - http://support.apple.com/kb/ht1391

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Use a data recovery product such as the ones listed here, and then get a replacement drive.
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Circle with slash/won't recognize DVD or external drives

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