MY COMPUTER WILL NOT BOOT UP TO LOG ON.

I have a HP Compaq 2710p. I cannot log on. I get the screen to use safe mode, etc.

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Computer will not boot up; only rotating wheel. OS 10.7 iMac

computer will not boot up, only rotating wheel. OS 10.7, iMac

Bootup holding CMD+r, or the Option/alt key to boot from the Restore partitiion & use Disk Utility from there to Repair the Disk, then Permissions.
Re-install if that doesn't work.

Computer will not boot up. a circle with a line thru it appears.

All of a sudden my computer will not boot up and a circle with a line thru it comes up. What is the problem and what can I do to fix it?

Hi, master hunter.
The most common meaning of this symbol is that something in the operating system is damaged. Here is the best resource when troubleshooting this behavior.
OS X: About kernel panics
http://support.apple.com/kb/TS3742
If you prefer us to assist you with this issue, contact us here.
Cheers,
Jason H.

Computer will not boot up on usb cd rom to repair windows problem (corrupt file) what should i do

computer will not boot up on usb cd rom to repair windows problem (corrupt file) what should i do

Which computer? Which Windows?
What are you trying to do?
-Jerry

Will not boot up to log in screen

will not boot up to log in screen when powered up, all I get is a grey screen with apple logo in middle and spinning timer
I have tried resetting SMC
I have tried starting up in Safe Mode (it won't do that either)
I have gotten into disk utility to repair disk
I have tried resetting PRAM
nothing... we are on a network in a school district so my next step is to re-image it but wondering if there is something else I should try first
if not then how do I backup files that are needed before I re-image
thanks, Cindy

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
     a. Start up from the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
c. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
d. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a startup failure can be resolved by resetting the NVRAM.
Step 4
If you use a wireless keyboard, trackpad, or mouse, replace or recharge the batteries. The battery level shown in the Bluetooth menu item may not be accurate.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
Step 7
If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
Start up in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 11. If you ever have another problem with the drive, replace it immediately.
If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then restart as usual (i.e., not in safe mode.)
If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then restart as usual.
Step 9
If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
Step 10
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 12
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 13
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

Have a MacBook Pro. the computer will not boot up, the screen has black and white stripes and multi color bands as well.

Have a MacBookPro. The computer will not boot up. the screen has black and white bands with multi color bands as well.

Yeah it's dead. Take it to an Apple Genius Bar and have it checked out. Then buy a new one.

Computer Will Not Boot

My computer will not boot and it will not enter Safe Mode. I ran the Memory Diagnostic test and it shows that I have a hardware problem. I also tried to restore my computer to an earlier time but it showed an error. I have 1GB or RAM and recently it keeps changing from 512MB to 1023MB. Please help.
Specs (that I know of)
1GB RAM
INTEL CORE 2 DUO 2.43GHz (I'm not sure)
Gigabyte motherboard
OS: WINDOWS 7 ULTIMATE
This question was solved.
View Solution.

try to make shour that the ram is snug and in all th way make shour NOT to jam them in and dont leve a empty slot in betwen them if there craced be shore not to use the in any in the computer check the mother bords slots and the pins on the ram and make shour that theres no dust stuck in there . thats all i can think of hope it works out for u. :^)

Help needed on startup. My computer will not boot from the CD drive!!!

Problem with iMac G3 333, the Message on the screen states: "The System Software on the starup disk only functions on the media, not if copied to another drive." Like a fool, I copied the system folder from the original system software 9.2.2 on to the iMac. System disk which is not a complete system folder when used on the computer. I have searched the Internet, but can not find an answer. I have tried everything, holding down the C key, "Delete, Opition, Apple key, shift" holding the mouse down on startup, various combinations of other keys, etc. The CD starts to spin, but the computer switches to the hard drive and the message above returns. No matter what I try I still can't boot from the tray loading CD drive. Is there any Firmware code that I can use. I know how to access Firmware on the Imac and can boot the iMac using Firmware, but I don't know how to use Firmware to boot the CD drive which I need to do so I can reload the original software. CAN SOMEONE PLEASE HELP? Thanks, Jim

Yes, I have tried both System Softwares a number of times. The C key will not boot up the CD drive and the harddrive always boots with the original message. I need to get the CD drive to boot so I can reloaded tge original software. Do you know anything about booting the CD drive using Firmware? Jim

Computer will not boot up. I have tried running disk utility and re-installing OSX. It says disk locked

I am new to Macs and have bought a 13" Macbook Pro and a IMac 21.5" 14 months ago. I have only used the Macbook pro about 15-20 times and after upgrading to Maverick it will not boot up. I get the white screen and a spinning circle. I have tried Disk utility repair and even re-installing the OSX, but it says disk locked. I do not recall setting any password protections or passwords. I now have a brick with a lit up Apple logo. If anyone knows how I can bypass the disk lock error or reset the laptop, please let me know. This has not been a pleasant conversion from PC's. Even my IMac blacks out from time to time and both happened right after my factory warranty expired.

The internal drive is malfunctioning. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional — ask if you need guidance.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
*An SSD doesn't need to be zeroed.

Blue screen, computer will not boot up

My computer, when powered up gets stuck on a blue screen and will not boot up. I have restarted & held down the shift button for safe mode & it goes to a white screen with a grey apple icon but will not move past this screen. How do I get the computer to boot up?

Sounds like your system is hosed. Try [repairing the hard drive with Disk Utility|http://support.apple.com/kb/TS1417]. Of course, from the sounds of it, even if you get the drive repaired, it may not fix the problems with your system.
Do you have backups? If not, your only priority at the moment should be to figure out how to back up your data, or what data may still be intact if your drive is badly damaged. If you have another Mac, the easiest way to do this will be to boot the machine into [FireWire target mode|http://support.apple.com/kb/HT1661] and copy whatever data you can.

Computer will not boot up but fan will turn on and stay on.

I have a Gateway and I did not have enough memory. I bought 1Gig to give it enough memory to run the basic systems. I added the memory to the slot in the hard drive and now it will not boot up. The fan just turns on and runs. I took out the new memory and it does the same thing. No working computer. Need help on what I should do besides Punt.
Thanks,
ZCDJSouza

First and foremost, recheck all internal connections to make sure you didn't bump something loose while replacing the RAM. I had the exact same thing happen to me once before only to find that I had accidentally loosened the cable to the hard drive.
*I am a BB employee but my opinions are my own.*

Computer will not boot up correctly in any mode.

Hello,
I have a Compaq Presario CQ62 with Windows 7 that will not boot up to my log in screen and it does not matter what mode I put it in..safe..etc. I have tried everything I know to do ...like system recovery in the recovery manager. I have no recovery disk or anything. Any help

That means the internal drive has failed, or there's some other hardware fault. What backups do you have?

Hp pavilion elite e9120y pc computer will not boot up. memory could not read

HP Pavilion Elite e9120y PC Vista Computer wil not boot two error messages 1. instruction at 0x74d605ef referenced
memory at 0x00000114. The memory could not be read 2. Error 0x40011002000001012 if this issues continues. Please contact HP Support

Hi @gjtomlin ,
Thank you for visiting the HP Support Forums and Welcome. I have read that you are interested in re-install the operating system back on your HP Pavilion TouchSmart 14-b109wm Sleekbook. Try performing a hard reset.
When performing a hard reset please note remove any and all USB devices. Disconnect all non-essential devices.
Here is a link to computer won't start for Windows 8.
You might benefit from a Windows 8 refresh.
It load defaults on the Notebook without disks. Here is a link to your drivers and software page.
I hope this helps.
Thanks.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

Computer will not boot failure ID 0GBQ9A-5NJ7JV-MFH15F-60RM03

COMPUTER DOES NOT BOOT UP ERROR MESSAGE HARD DISK 1

Sounds like the hard drive has failed and will need to be replaced. If you are still in warranty HP will send a replacement. If not a retail laptop SATA hard drive can be used. Just be sure to get one of at least equal capacity as the original in order to use Recovery Discs. It can be larger, but not smaller capacity.For instance you have a 640GB hdd so you could use a 750GB hdd but not a 500GB hdd.
Your Maintenance & Service Guide shows how to change hard drive:
http://h10032.www1.hp.com/ctg/Manual/c02842252
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Computer will not boot up after recent software install

I recently tried to install a series of software updates. Not all were successful. Soon therafter the computer froze up while in safari. I turned it off and the computer would not boot up on restart, and instead sent me to the darwin login screen. I rebooted in safe mode per these forums, and turned off an itunes startup function, and then rebooted. That seemed to do the trick as I could now get back into the OS, but the computer was dreadfully slow. It froze up again in Safari and I turned it off again, and this time it would not go past the grey startup screen with the apple. I tried safe mode again, but the computer would shut down around 30 seconds after the wheel below the grey apple started turning. I Was able to get my Tiger Install DVD in the drive, and turned the computer back on, but now just get the grey apple screen and the wheel spinning indefinitely. I cannot do an erase and install because my photos are not backed up. Please help!
Thanks

Hi, Deaton41. Welcome to the Discussions.
You wrote: "I recently tried to install a series of software updates. Not all were successful."I suspect the only way you are going to resolve this is by performing an Archive and Install. For important tips on this process, see my "General advice on performing an Archive and Install" FAQ. Perform the steps therein in the specified order. If you follow my FAQ's steps to the letter, then your photos should be AOK, assuming directory corruption hasn't damaged them. I suspect directory corruption is the root cause of the unsuccessful software updates, which that then led to your current problem re: start up.
Before installing future software updates, you may wish to consider the advice in my "Installing Software Updates" FAQ. Taking the steps therein before installing an update often helps avert problems and gives you a fallback position in case trouble arises.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

MY COMPUTER WILL NOT BOOT UP TO LOG ON.

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