Continues to cycle on and off on boot

mac will not boot up, continues to cycle on and off. Apple logo is displayed and chimes, then will cycle to black screen and then on again. tried to use cmd R but does not go to gray screen

Version of OS X, what computer? Most of us uninstalled our mind reading app, they didn't work anyway?
Run Apple's Hardware Test in extended mode 2-3 times back to back. If errors appear that confirms it's a hardware issue and needs to go in for service.

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Time Capsule HDD keeps cycling on and off while my Mac is sleeping

Hi guys, I'm in a bit of a hurry so just gonna post dot points:
• My Time Capsule's HDD keeps cycling on and off continuously and potentially doing heaps of damage to it's drive when my MacBook is sleeping.
• Time Machine is set to automatically backup to my time capsule.
• As soon as I wake up and log into my MacBook it seems to stop. I checked the time capsule icon immediately and it says "Preparing backup" so I assume it was stuck in that phrase.
• I assume it backs up normally after waking up
MacBook Pro Retina:
• I usually never put my MacBook to sleep by closing the screen, so can't say if this happens when it's in closed screen sleep vs open screened sleep
• I'm not sure if there's any difference between close screen sleep and open screen sleep
• It is set to go to sleep automatically after 45mins of inactivity
• My iTunes Library is stored off-device on a 2TB HDD connected to the Time Capsule
Cheers,
Tony

How old is the TC and on what firmware?
You have put Mountain Lion for OS.. is that still the case or upgraded to Mavericks??
There has been some issues at various times with disk spinning up ..
This thread might give you some clues.
https://discussions.apple.com/thread/4148904?start=0&tstart=0
Is the computer set to power nap? Try turning that off.
Try unplugging the external drive with itunes library and see if that helps.
If it is TM the attempts to start the backup should be in the log.
See A1 pondini troubleshooting.
http://pondini.org/TM/Troubleshooting.html
Power nap.. try unplugging the laptop from power.
http://support.apple.com/kb/ht5394

I am trying to download a variety of files and when it is finished, the Mac freezes up and the task bar continues to blink on and off. I have to go into Firefox and actually quit the application to continue. Any help is very much appreciated

I am trying to download a variety of files and when it is finished, the Mac freezes up and the task bar continue to blink on and off.
I have to go into Firefox and actually quit the application to continue. Any help is very much appreciated.

are you backing up files, or doing a Time machine backup, either way, the Time machine will STOP when finished and show "last backup at XXXXXX" meaning its done...... OR if when transferring files, it will show a progress bar on your desktop and vanish when files are copied.
Open up the Hitachi drive (your G drive is made by Hitachi, and the best made by the way).....and see if the files are there.
a MORE VISUAL way is to open the hard drive file, and drag and drop files INTO the Gdrive and you can see them visually be copied there as you do it.
To see your HD on your desktop GOTO FINDER......PREFERENCES....then GENERAL TAB.........check the box marked HARD DRIVES.........then your Gdrive will appear on your desktop........open it from there, and DRAG and drop files from anywhere INTO the Gdrive....... easy visual way to see the files being copied into the Gdrive.

Fans Constantly Cycling On and Off

About a week ago the fans on my dual 2.0 G5 running 10.4.8 started cycling on and off. After a few days of this I ran AHT and received the following error:
Error Code 2STH/1/2:CPUA AD7417 AD1.
I found out this was a possible problem with the logic board and immediately took it in to the local Apple authorised repair center. They tested it and found a Thermometer failure on CPUA AD7417. They removed both processors, reset the logic board,reinstalled the processors, and completed calibration. After which they ran ADT test and Apple G5 Service test disk twice. According to them the G5 passed all the tests and had no problems.
After I got home and set it back up the fans started cycling on and off just as they did before I took it in for repairs–they cycle on and off regardless of the ambient temperature or the amount of work the processors are performing. I ran AHT's extended test which it passed with no problems.
What's going on? Did they mess up when they were doing the calibration? Am I going to have the same problems that prompted me to take it in for repairs to begin with? Is there a serious hardware problem that they failed to discover?
The service was poor, and they even managed to scratch the **** out of the side of my G5, so I don't really want to take it back to them again. Unfortunately the closest Apple Store is about 4 hours away and my G5 is no longer under warranty.
Any suggestions about what's causing the problem and what I should do would be really appreciated. Thanks.

Blinn–
Nope, I hadn't installed a software update. It just came out of nowhere. If you haven't done so, I reccommend running AHT to see what it shows. Hopefully you're just having a software problem.
DaddyPaycheck–
Thanks. That clears it up. I am definitely going to call Apple. I am really fuming about the lack of service I've had from the "Authorised Repair Center."
UPDATE
It just keeps getting worse. Now the G5's fans are really revving up and it is putting itself to sleep with increasing frequency. I just got off the phone with the guy who "repaired" it. The reason that AHT is showing the same error code, but on processor B is because when he reinstalled the processors after resetting the logic board he switched them. According to him, this error shows that it is a problem with processor B, which will need to be replaced. It's going to cost $581 for the CPU–no charge for labour since I've already paid to have it fixed once even though it wasn't!–but I don't think I want anyone at that shop working on it again.
Has anyone else replaced a CPU in a dual 2.0 G5? How much did it cost you? Is this something that I could do myself?
I think that before I do anything else I'm going to take DaddyPaycheck's advice and call Apple. At least then Apple will know that this authorised repair center is doing a terrible job!

Phone cycles on and off. I have restored and so has the apple store.

I had a screen sensitivity issue with my original 4s. It would react to my finger getting within about 1/4 inch of the screen, and would auto dial without anyone touching the screen. Fortunately, It happened to actually do this in front of one of the 'geniuses' on my third trip to the apple store so they replaced the phone about 5 months ago. I was given a 90 day warranty on the new phone. It worked fine until last week.
It started cycling on and off. Then it wiped the phone and all of my apps. I restored the phone but there would be a noticeable hesitation between when I touched the screen and when the touch registered. This went on for two days.During those two days the power indicator did not ever show any indication there had been any battery drain, but always showed 100% charged, days, then went dead without ever showing it was discharging. I took it to the Apple store. They tried to do the same restore I had. The phone came back on, but then cuts on and off to the Apple logo. The battery will take a charge, but as it sits on the charger it cuts on and off. The store solution was for me to purchase a new phone since they either had no idea what the problem was, or wouldn't tell me. The phone has not had rough treatment or been exposed to water or excessive moisture. Any suggestions?

try to force restore using: http://support.apple.com/kb/ht1808
If that doesn't work, I'm afraid the device needs another hardware repair.
Please note that using that article will erase everything so make sure you've got a backup.
But restore it AS NEW if it's at all possible.
Good luck
Stijn

MSI X99S Xpower AC Cycles on and Off

My rig has been stable for the past month (please refer to footer for components) and today it started to just cycle on and off in approximately 5 -10 second intervals. I downloaded and updated my bios 30 days ago, and it has been very stable. I also verified the BIOS settings today to make sure they were OK. However, today it just started to cycle on and off. When this occurs, the power supply is also powering on and off which may be the culprit. Could the power supply be going into hibernation with the CPU I have? Not sure how if it has been working fine. I also do not overclock at this time. Any suggestions on what to try?

Not sure how concerned I should be, however, yesterday when I was going to perform the tasks posted by pandaz, as well as perform the paper clip test on the power supply (this verifies the integrity of the power supply by taking the MOBO out of the equation), the issue did not reoccur from the previous day (it was off all night, but still plugged in). The first time this happened (shortly after building my rig about two months ago), simply clearing the CMOS took care of the issue (in review of my notes), and this time, clearing the CMOS did not, however, letting it sit overnight did. Do I have an issue I need to be concerned about? My legacy XPower Big Bang never had any issues after setting it up a few years ago. Thoughts?

Airport cycling on and off repeatedly

I have a time capsule purchased March 2008. The updates are current. Had no problems until the last 2-3 days. Now, it is cycling on and off. It will not stay connected to the internet. The light goes from green to yellow to off to yellow to green. I have shut everything off, unplugged the time capsule, the DSL, ran the disk repair utility.
There are no clicking noises. When it is working with the green light, all seems well but it keeps shutting down.
Is it broke? Software problem?

Will I loose all my backups when the power completely fails? It is a 2 terrabyte hard drive and I have it full with 2 machines backed up on it.
The data should not be affected as it is stored on the internal hard drive ... which (push comes to shove) can be removed. One thing you can do, is if you have another USB drive handy is to perform a data archive to add some additional "insurance." You have been doing these all along, haven't you?
I can get the Apple store to put a new power supply? Or should I buy a new time capsule?
There are no replaceable parts that I am aware that Apple will perform on the TC, but it would be a good idea to have the Apple Technician give the TC a good look at to verify if even the power supply is an issue in the first place.

My iPhone is continually turning itself on and off, how do I solve?

It's turned itself off and then when I tried to turn it back on it continually turns itself n and off! How do I solve it?

Restore the phone in iTunes, first using a backup, and if needed as a new iPhone without using a backup. If this still happens after restoring as new, there is a hardware problem than needs evaluation by Apple or whoever provides iPhone service in your country.
iTunes: Backing up, updating, and restoring iOS software

My iphone cycles on and off how can I fix this

My iphone cycles on and off how can I fix this?

Basics from the manual are restart, reset, restore.
Try these.

GMail cycles on and off on iPad

Sometimes, when I open the Gmail App, the Gmail screen cycles on and off. Then I go to Safari, to access Gmail and it opens normally. Why does the Gmail App cycle on and off sometimes?

Close the Mail app in the Task Bar and re-launch.
Double-click the Home button to reveal Task Bar. Hold Mail app down for a second or two; tap the minus sign to close app.
If it still doesn't work, try a reset.
Hold the Sleep and Home button down (together) for about 10 seconds until you see the Apple logo.

IPad (3rd gen) Wi-Fi which keeps cycling on and off.

I have a iPad (3rd gen) Wi-Fi which keeps cycling on and off.

Please tell me that it has NEVER been jailbroke. If it has not been jailbroke, here are some standard repair procedures:
First, try a system reset. It cures many ills and it's quick, easy and harmless...
Hold down the on/off switch and the Home button simultaneously until you see the Apple logo. Ignore the "Slide to power off" text if it appears. You will not lose any apps, data, music, movies, settings, etc.
If the Reset doesn't work, try a Restore. Note that it's nowhere near as quick as a Reset. It could take well over an hour! Connect via cable to the computer that you use for sync. From iTunes, select the iPad/iPod and then select the Summary tab. Follow the on-screen directions for Restore and be sure to say "yes" to the backup. You will be warned that all data (apps, music, movies, etc.) will be erased but, as the Restore finishes, you will be asked if you wish the contents of the backup to be copied to the iPad/iPod. Again, say "yes."
At the end of the basic Restore, you will be asked if you wish to sync the iPad/iPod. As before, say "yes." Note that that sync selection will disappear and the Restore will end if you do not respond within a reasonable time. If that happens, only the apps that are part of the IOS will appear on your device. Corrective action is simple - choose manual "Sync" from the bottom right of iTunes.
If you're unable to do the Restore (or it doesn't help), go into Recovery Mode per the instructions here. You WILL lose all of your data (game scores, etc,) but, for the most part, you can redownload apps and music without being charged again. Also, if you have IOS-7, read this.

HP C8180 All in one continually cycling on and off

My C8180 has had problems continually cyling on and off throwing errors telling me to use the power switch ando not to unplug the power source. This started happening after a power outage while it was on. At one point after several recycles, I got this error on a blue screen under a power button symbol "B3E0C330". Is there anything I can check or replace without sending this in for service or replacing it altogether? It's really disturbing that just a power outage could wreak this much havoc on the device, but I probably should have had it behind a surge protector. All other electronic devices connected at the time are fine.
Thanks

I haven't tried it yet, but that is what I found in another forum. The guy said there are purple or green capacitors on the power supply board that you can clearly see are swollen and busted. It makes sense given the symptoms. You'll need to know how to solder and will need the tools once you get the replacement parts, but it sure beats throwing this thing out. For me it's the principal of the thing.
HP, how do you design a device like this that has such a fragile power supply? {Content Removed: legal discussion} I've seen plenty of people on this and other forums that have had the same problem with this particular device, but I guess a warranty is a warranty, you just don't need to buy HP again. I know I won't. Too bad Apple doesn't make printers!

While using phone screen continuously cycles on and off not allowing me to push buttons on screen

I've been noticing since purchasing the iPhone 5 for Christmas(2012) that when I am on the phone and I need to press buttons on the screen( like press one for english) the phone's screen will cycle on and of not allowing me to press anything. Even to the point sometimes it will not allow me to hit the end button to end the call. I have to Hit power/lock button to end call. Really anyoning espicially when talking a computer aided 1800 number. Also there is a intermittent loud hum coming from the ear speaker. Is this common problem with these or should I take it in to store? It only seems to happen while using the phone.

I had the same problem and was convinced my new phone was broken. I scoffed at the suggestions I saw here that it was my 2G's Piel Frama case. And you know what? That's what it ended up being. There's a little part of it on the upper left of the iphone and when the phone went black as I removed it from my ear to look for the keypad, I pulled that piece of leather away and poof! I had a keypad. It was totally the case. The new phone fits in the old case just fine, but the placement of the sensor isn't in the same place. I wouldn't have believed it otherwise.
BTW, if you hit the home button when that happens you'll get your screen back, but it's better to fix the case issue.

Monitor cycles on and off many times before settling and staying on

When I turn my mac mini on or revive it from sleep, the monitor wakes up for a short time, then goes black for 30 seconds then revives itself for about 23 seconds in a cycle (on, off, on, off) that lasts about 30 minutes, maybe longer. After which, the monitor stays on indefinitely.
...until the computer goes back to sleep or is turned off... then the whole cycle starts over.
I do not have to touch anything for the cycles to happen.
The computer is running fine, in fact I can continue to type... I just cant see what I am doing.
This problem is a recent development and was not triggered by anything I am aware of.
After 6-8 times of going through this, I have not yet noticed any change in duration of cycles or of the length of time before it settles out.
I have a Mac Mini (Mid 2011)
External DELL monitor connected via Thunderbolt port mini display port to VGA.
I have tried reseting the SMC and PRAM with no correction to the problem.

Hello slodave,
Since you are not hearing the hard drives or anything kick on for a while it sounds like the issue may be with your power supply.
You may want to look at the power supply there should be a light on it. See if it shows it is starting properly before the computer actually turns on (so this is during the 6+ times it is turning on and off).
If the power supply is going then you may just need to replace it to continue normal operation.
If I have helped you in any way click the Kudos button to say Thanks.
The community works together, click Accept as Solution on the post that solves your issue for other members of the community to benefit from the solution.
- Friendship is magical.

Qosmio F50-10Z - fan cycling on and off even when idle

My f50 is constantly turning the fan on and off every couple of minutes, even when the machine is idle and has not run any applications.
SpeedFan shows that the GPU is cycling constantly between 55 and 65 degrees C even when there are no apps running (e.g. just after booting) - the fan kicks in at 65, turns off at 55 and then slowly heats up again. The fan noise is noticeable (I don't think it is going full speed, though), and it is a bit abrupt and annoying to be happening constantly and doesn't seem like normal behavior. Core 1 and 2 on Speedfan are cycling between 40 and 45 C
Outside temperature is 20 degrees, so the environment is unlikely to be a factor. I've air blasted the fan for dust (as much as you can seeing as the f50 isn't built to be taken apart by a Home User), but even when the fan is running the output doesn't seem noticeably hot.
I'm am only running toshiba drivers from the website (currently 7.15.11.7590)
My main concern is that this will negatively impact the life of the fan. Am I being overly picky or is there something I could be doing?
Thanks for any advice

Thanks for the reply Lars_3.
The notebook came with Windows Home Premium pre-installed - I haven't replaced the OS at all, though I have created a recovery disk at the urging of OS when I first booted it.
The BIOS is up-to-date as I use the Toshiba Tempro service (which again was pre-installed) and occasionally check with the website to make sure I haven't missed anything. I don't like the idea of installing drivers or anything else not released by Toshiba as I've seen people mentioning overheating shutdowns (at much higher temps) from using non-f50 drivers. I regularly keep the base elevated to enhance air circulation, and clean the intakes with compressed air, but it doesn't seem to make much difference.
Everything else works perfectly (and I'm a happy customer) except for the noise factor of the fan switching on every two minutes during even light use (not even 3d game use, which I assume would utilise the 3d card more and be expected to come with greater fan use).

Continues to cycle on and off on boot

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