If it is under warranty insist they fix or replace the thing--Apple refurbs tend to be reliable and often remarkable values. Disable "Hibernation" on your system and restart the system to check what happens "overnight".
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Did you check the voltage in need of your RAM modules? Starting with Sierra, the supplied voltage has been reduced on nearly every part in the hardware. In former times USB voltage was sufficient to directly mount external drives - nowadays it depends on the age of the ext HD.
The now supported voltage was decreased on systems, while the external devices still is in need of the higher voltage and is unable to be connected and mounted. Now theses standard has been reduced to 1,35V If your 16GB RAM are not provided with a trigger to detect which the supplied voltage is, e.
Perhaps the most frequent cause of the prohibited sign in both Apple made and hackintosh machines that can also cause problems returning from sleep state has to do with in the USB systems. Thanks for the lengthy discussion. My iMac still has a few months of Apple Care left to run on it, so if I want to look at the bright side of my problems -- at least they came when the computer still had a warranty left.
The on-phone technical help suggested connecting and disconnecting various USB devices to see if that made a difference in the Prohibitory Symbol appearing, but it did not seem to.
I normally run the computer with two powered USB hubs attached to which I have a number of external hard drives, printer, scanner, etc. So I tried disconnecting the hubs one at a time, then disconnecting both hubs, then disconnecting the USB keyboard and using a firewire keyboard and mouse. In each case the Prohibitory Symbol reappeared. So I'm currently waiting until the Apple Store gets back to me with the results of their latest tests.
Their first attempt to fix it failed. It's easy to find out: 1. Run like that for days. Does anything change? One other thing to try: DON'T put it to sleep at night. Instead, shut it down, powered all the way off. Does it reboot ok the next morning?
Thanks for the suggestions. When I get it back from the Apple Store, I'll try these things. Even had issues with a Crucial RAM once. Replaced it with a new Crucial and everything was fine.
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One advantage with RAM: easy to check. Thanks to all for your input and suggestions. When I booted in restore mode off an external drive in terminal I could see several partitions of several assorted sizes.
I called him and wanted to know how old the drive was? OWC came through and he got a new drive. I'm kinda thinking that, if I were a technician and thought the ram was the problem, I would have tested with different ram to start with. If it worked with different ram I could then tell the customer with certainty "Yes, the ram went bad". Experience, unfortunately, is generally the result of bad judgement" - attributed to a whole bunch of folks. Over a week later, the Apple Store technicians term used loosely are still stumped.
So they replaced the Fusion Drive solid state drive on the circuit board no change and tried a new Logic Board still no good , and are now claiming that third party RAM somehow is causing the Prohibitory Symbol to appear even when the third party RAM is no longer installed. So I complained a whole lot and they have ordered me a new iMac -- this time with an SSD but I still have to pay for the upgrade. Over a week later, the Apple Store technicians The Epson V is a reasonably priced scanner aimed at analog film shooters. It's fairly easy to operate and capable of decent image quality, but still easily bested by scans from our local photo lab.
Mac shows No Entry sign on boot
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No entry sign - Microsoft Community
Started Mar 10, Discussions. Forum Threaded view. Mar 10, Thank you. CameraCarl wrote: I have a 2.
No entry sign
If the boot chimes are replaced by any alternative audio signals such as loud beeps, then this indicates the system's hardware or firmware is malfunctioning or not properly set up. Provided the system's hardware is working properly, then you may see a blinking question mark if a boot volume cannot be found, but beyond this you may see a prohibitory sign show up on the screen. Generally when the prohibitory sign shows up, you will initially see the gray Apple logo, followed by the presentation of the prohibitory sign after a few moments.
This indicates that the system has found and recognizes your installed OS as a valid OS, but cannot boot from it because of some problem with the system. If this occurs, then there are two things you can do to fix it. Boot to Safe Mode Usually this problem happens because some kernel extension cannot be loaded or configured properly during bootup.
If you have manually tampered with your system's extensions and have inadvertently edited one or changed permissions on it, then the system may not load it properly during start-up. If the extension is a nonessential extension, then booting into Safe Mode may allow you to fully boot the system, from which you can then try running permissions repair routines. To do this, power down your system and then start it up with the Shift key held down, and if the system loads then open Disk Utility, select your boot volume, and then run a Permissions Fix routine on it.
After the routine completes, restart the system and hope you can boot without the prohibitory sign. As a final step, while rare this may also be caused by a faulty third-party application installation, so if you have recently updated or installed a new program and are experiencing this problem then you might be able to get around it by uninstalling the program.
Again, boot to Safe Mode and either run the application's uninstaller or otherwise remove the program and its associated extensions contact the developer for details on what files are associated with the program. Luckily Apple makes this is a fairly straightforward task, especially with Snow Leopard where the default behavior for reinstalling will just overwrite the OS with a new installation, leaving your applications, data, and settings intact. If you are using Leopard, click the Options button in the installer and select the option to perform an "Archive and Install" method of installation along with checking the box to "Preserve Users and Network Settings.
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