Reboot hang

Hi All,
Last night I just finished up doing a long gaming session on my macbook in vista 64 ultimate. I went to reboot, and the machine rebooted to the gray screen, and just hung there.
Now I had a usb mouse plugged in while it was rebooting, and took it out during the bootup process. Not sure if that would cause an issue. Anyway, I let the screen sit for about 3 minutes, and nothing happened. So I held down the power button and then powered it back on and everything came back fine.
Any ideas what might of happened? This is the second time I've had weird reboot issues coming from Vista. I'm not sure if it is just that, a weird issue, or if perhaps something is wrong. Oh and I have a June 09 Unibody 17"
Thanks all for any help!

Hi,
I have the exact same problem with the 514G and with the 525G2. I have these phones setup with 3cx pbx's for several customers and they all have the same problem with these phones: ass soon as they answer a call from a call queue the phone will freeze and eventually reboot. If the call is answered from a direct call or a ring group the phone works just fine.
I have a support case going with cisco but it's slow going. (took me 3 months to get them to setup a phone in their labs and reproduce the issue)
I do have a workaround for the moment: If I disable the: "support replaces header" option the issue is resolved. Althouh I have been advised that this could have negative effects on other functions (didn't notice any so far).
Upgrade of firmware tot 7.5.5 didn't fix the issue.
I don't have any BLF configured on these devices.
Regards,
Timmy

Similar Messages

Hyper-V - Virtualization - Reboot Hangs

HP ENVY 17-j151ei Notebook
Windows is running perfectly on my system until I install the hyper-v tools through "activate Windows features".
Reboots hangs.
Installed latest Bluetooth Drivers
Cold Restart
Please assist

Hi,
HP doesn't support virtualization on consumer PCs.
You would need to activiate hyper-v through the Windows turn features on and off that is available under the Control Panel -->Programs and Features. Additionally, you need to be running Windows 8 Pro or higher.
If you search the forum using the following key words tags you might find a solution.
VT, virtualization, hyper-v,VTx,VTd
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Mac Mini Reboot Hang

I’m writing this post because I am experiencing an intermittent hang on boot on my Late 2009 MacMini. The specs are:
Processor: 2.25 GHz
Memory: 2 GB
Graphics: NVIDIA GeForce 9400 256 MB
Software: OS X 10.8.5 (12F45)
More times than not, when I reboot the computer, I get a grey screen that hangs the boot until I do a hard restart (holding down the power button until the computer shuts down, waiting a minute, and then hitting the button again to restart the computer).
I have narrowed down the problem in the system.log to the following lines. Each time I have this hang, this is where the log ends before the hard restart is represented. However, I don’t understand what these lines mean and what problem they represent:
Jan 10 17:07:24 localhost com.apple.usbmuxd[29]: usbmuxd-323.1 on Oct 3 2013 at 12:43:24, running 64 bit
Jan 10 17:08:09 localhost configd[18]: InterfaceNamer: timed out waiting for IOKit to quiesce
Jan 10 17:08:09 localhost configd[18]: Busy services :
Jan 10 17:08:09 localhost configd[18]: Macmini3,1 [1, 73889 ms]
I have tried the following remedies to fix this problem:
Full drive reformat and clean reinstall of the system software.
Disconnecting any external drives attached via USB.
If someone could give me an idea of what kind of problem I’m facing and any possible remedies I would very much appreciate it. Thanks!

Step 1
Disconnect all wired peripherals except those needed to boot, and remove anything that's inserted in the card-reader slot, if your model has one, including an empty adapter.
Step 2
Reset the System Management Controller.
Step 3
Boot in safe mode. This will cause certain caches maintained by the system to be rebuilt.
Safe mode is much slower to boot than normal.
When the login screen appears, reboot as usual (not in safe mode) and test. There's no need to log in while in safe mode.
Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode. In that case, ask for instructions.

Update to 10.3.1.1565 - reboot hangs

Hello,
I own 2 BBs (Z10-2 and Q10). The Update on the Q10 works fine, the Z10-2 starts the reboot but doesn't sucessfully finish. It hangs at 95 - 99% forever. Battery warms up - reboot ends up with the same situation.
Even reset and installation of a brandnew 10.2 version before update to 10.3.1.1565 didn't effect anything.
Any ideas?
Thanks in advance for any hints!

Due to the number of problems with "upgrading" to this OS level, I suggest you try the very clean and very forceful AutoLoader OS Reload:
http://supportforums.blackberry.com/t5/BlackBerry-10-OS-Device-Software/Upgrading-OS10-devices-using...
Beware that it is completely destructive...the device will be "like new"...no data, no apps, no accounts, etc. Be sure you take a full backup first, as well as make full manual documentation of all apps, accounts, configurations, etc. Sometimes a restore reintroduces the very corruption one is trying to eliminate, and manual reconfiguration is necessary.
You can also use this to fall back to a prior OS if you desire...you can install any OS level for which you can find an AutoLoader. (Hint...search over on the CB site!)
Good luck and let us know!
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
Join our BBM Channels
BSCF General Channel
PIN: C0001B7B4 Display/Scan Bar Code
Knowledge Base Updates
PIN: C0005A9AA Display/Scan Bar Code

Reboot hangs and takes several minutes to reboot

Hello fellow archers I have a Vaio laptop and my system started to hang and takes several minutes to reboot.
I have no real clue as to why since poweroff works fine and reboot used to work fine.
I did a system update. And more recently migrated to systemd, may not be related
edit: I found a workaround. Adding the following to my grub kernel line
reboot=pci
But it does not reboot quite the same way, meaning the power led no longer goes off and back on.
Still haven't quite figured out why I can no longer reboot normally without this workaround.
Last edited by snoxu (2012-10-18 18:16:18)

I am also having this problem. When trying to reboot, I get an endless cycle of the BIOS screen, then "MACHINE ERROR", then back. Running the same dmesg command as snoxu results in a similar error message. I am forced to shutdown by holding the power button. Upon rebooting, I get an error message that all extensions have been turned off (using Gnome Shell). Then I have to logout and login.
Shutting down and then restarting works fine.
Additional info:
System76 Gazelle Professional laptop
syslinux, systemd, GDM, Gnome Shell

K8N NEO PLATINUM Nvidia nforce 3 250 GB Chipset rebooting - hanging !@$%@#$@

Hi folks,
I am working on the K8N NEO platinum motherboard based on the Nvidia nforce 3 250 GB Chipset.
A couple of days ago I lost my internet connection (broadband). After a couple of minutes it ok again. But suddenly the computer frooze.
After rebooting (button on case) I found out that lots of things couldn't be closed anymore once they were opened. I needed to use CTRL-ALT-DEL to go the the active Tasks. But then that started to freeze too so I decided to wipe everything of the system.
I repartioned and reformated the computer with the win XP PRO CD and reinstalled the OS. I saw immediatly that the system was slower then before and that it did not found the internet connection anymore. I checked the LAN connection and there it sayed that the LAN card was working well but that no cables were connected. This was not true because I dubbel checked them twice. I even replace the cable. It was not my Internet provider neighter because the computer is in a local network and others had no problem to access the internet. So I decided to reinstall and reinstall it again. I reinstalled the system (partioning, formatting) it 4 times. The last time suddenly it found my connection back. Then I installed all updates of windows and I used my live update from MSI to update my components.
I am using live update 3 and updated the BIOS and all other parts who needed to be updated. This was done without the presence of a AV and so on. Everything went well and no errors occured. I received everytime a message with success.
Today my computer suddenly hanged itself again. This already 3 times. Nothing is possible anymore except the boot button on the case.
I also encountered 3 times the while surfing the computer suddenly reboots itself without any warning or message.
What the hell is going wrong here ???
Can aynone give me a clue please ?
Is the motherboard dying ?
MSI live bios Version 3.7.000
MS-7030(K8N Neo Series / K8N Neo platinum)
BIOS version 1.7 (latest version)
Award bios release
2005/05/10

Charly.P
Russ_xp was asking about the Max amps on your power supply should be on label like this:-
Need yours - 3.3v= ??A.5v=??A,12v=??A
luck

Solaris 8 branded zone not booting after server reboot hangs at ready state

Hi,
For ipchange/hostname change we rebooted the physical server...once rebooting the Solaris brand 8 zone stucks at ready state.
I have run the truss with zoneadm in the log process sleep and wait
Will post the log soon..any help to troubleshoot the issue
Both global zone and Ng zone having same hostid..
dmesg::
Apr 30 13:08:50 xyz zoneadmd[992]: [ID 702911 daemon.error] [zone 'abc'] WARNING: console /devices//pseudo/zconsnex@1/zcons@0 found, but it could not be removed.: I/O error
bash-3.00# ps -ef|grep -i abc
root 1441 1429 0 13:10:56 ? 0:00 /bin/ksh -p /usr/lib/brand/solaris8/s8_boot abc /abc
root 1429 1 0 13:10:55 ? 0:00 zoneadmd -z abc
root 1427 1397 0 13:10:54 pts/3 0:00 zoneadm -z abc boot -f -s
root 1542 1441 0 13:10:56 ? 0:00 /bin/ksh -p /usr/lib/brand/solaris8/s8_boot abc /abc
zoneadm list -cv
2 abc ready /abc solaris8 shared
Thanks
Edited by: muvvas on Apr 30, 2012 2:25 PM

moved the solaris 8 branded zone to other server.their its working fine.sorry for late reply.

[SOLVED]libpcre.so.0 missing - reboot hangs after recent update

Hi,
I did an update today, the update for filesystem said that libpcre.so.0 is missing. Where can I find it? Do I need it? Thanks for a reply before I need to restart - and possibly lose my system...
Current stuff installed
grep 2.10-3
filesystem 2012.2-2
pcre 8.30-1
The trouble seemed to happen when adding a group that aleready exists...
Thor
Edit - trusting the post at https://bbs.archlinux.org/viewtopic.php … 3#p1060743 and more to the point, post 11 (by falconindy) - I'll reboot, hoping to be back...
Last edited by Thor@Flanders (2012-02-22 16:21:19)

Thor@Flanders wrote:The system wanted to start HAL up, not possible, as HAL was not loaded anymore. Udev got upgraded, HAL was out of the picture since then.
Not the case. HAL still works fine with the latest udev. The issue must have been elsewhere.
@karol: I'd say a lot of people had something installed that used hal. That something moved on, but people kept hal, not knowing they don't need it anymore.

Reboot hangs after software update

Hi,
Sometimes when I use the Software Update utility and the computer requires a restart, it restarts normally. But other times (e.g. after the most recent update), on restart it "hangs" at the white screen. (Yes, I do hear the startup chime as expected; then it hangs.)
I've let the computer sit there for a while, figuring that maybe it had to process something, but even after an hour it still is at the same point. If I hold down the power button to shut the computer off and then restart, it seems fine again.
Is this normal? If it's not, any guesses as to what may be happening and what I can do to fix it?
thanks!
Fran

The following generally seems to keep me out of trouble:
There are no guarantees, but following this procedure when installing updates and upgrades on your Mac will go a long way towards avoiding unpleasant after effects and ‘post-update stress disorder’.
It is also worth noting that it is an extreme rarity for updates to cause upsets to your system, but they may well reveal pre-existing ones, particularly those of which you may have been unaware. If you are actually aware of any glitches, make sure they are fixed before proceeding further.
So before you do anything else:
If you can, make a full backup first.
Turn off sleep mode for both screen and hard disk.
1. Repair Permissions (in Disk Utility)
2. Verify the state of your hard disk using Disk Utility. If any faults are reported, restart from your install disk (holding down the C key), go to Disk Utility, and repair your startup disk. Restart again to get back to your startup disk.
At least you can now be reasonably certain that your system does not contain any obvious faults that might cause an update/upgrade to fail.
3. Download the correct version of the COMBO update from the Apple download site. If your car runs on gasoline you would not want to fill the tank with diesel, so don’t try to install the PPC updater on an Intel Mac!
If you prefer to download updates via Software Update in the Apple menu (which would ensure that the correct version for your Mac was being downloaded), it is not recommended to allow SU to install major (or even minor) updates automatically. Set Software Update to just download the updater without immediately installing it. There is always the possibility that the combined download and install (which can be a lengthy process) might be interrupted by a power outage or your cat walking across the keyboard, and an interrupted install will almost certainly cause havoc. Once it is downloaded, you can install at a time that suits you. You should make a backup copy of the updater on a CD in case you ever need a reinstall.
Using the Combo updater ensures that all system files changed since the original 10.4.0 are included, and any that may have been missed out or subsequently damaged will be repaired. The Delta updater, although a temptingly smaller download, only takes you from the previous version to the new one, i.e. for example from 10.4.9 to 10.4.10. Software Update will generally download the Delta updater only. The preferable Combo updater needs to be downloaded from Apple's download site.
Now proceed as follows:
4. Close all applications.
5. Unplug all peripherals except your keyboard and mouse.
6. Install the update/upgrade. Do not under any circumstances interrupt this procedure. Do not do anything else on your computer while it is installing. Be patient.
7. When it ask for a restart to complete the installation, click restart. This can take longer than normal, there are probably thousands of files to overwrite and place in the correct location. Do nothing while this is going on.
8. Once your Mac is awake, repair permissions again, and you should be good to go!
If your Mac seems slightly sluggish or ‘different’, perform a second restart. It can’t hurt and is sometimes efficacious!
9. Open a few of your most used applications and check that all is OK. In this connection please remember that not all manufacturers of third party applications and plug-ins, add-ons, haxies etc, will have had time to do any necessary rewrites to their software to make them 10.4.10. compliant. Give them a weeks or two while you regularly check their websites for updates. This applies particularly to plug-ins for Safari 3.
N.B. Do not attempt to install two different updates at the same time as each may have different routines and requirements. Follow the above recommendations for each update in turn.

H67MA-E45 hangs on reboot at boot code 92

I just built a new PC based on an H67MA-E45 board. It boots and works fine when power cycled, but fails to reboot, hanging at boot code 92 before even getting to the BIOS screen. Is there a list of boot codes somewhere? (the number in the lower right of the screen during POST). When booting from power off, the last part of the sequence is
B4 - 99 - one last beep - 92 - A2 - A3 - BIOS screen - windows
When rebooting, it gets to 92, but hangs there.
My board has BIOS 1.8. There are newer version, but they don't specifically address this issue and I've read some reports of other problems in newer BIOS versions. Any idea what's going on here or advice how to get this fixed? It's not a show-stopper, but it is pretty annoying.
H67MA-E45
i5-2500K
2 x 4GM PC-1600 DIMMs
using on-board graphics
Corsair Force 3 120GB SSD on SATA6 (port 0)
Seagate Barracuda 1TB on SATA6 (port 1)
Asus DVD on SATA3 (port 2)
PS/2 kbd
USB mouse
USB 1TB external disk
USB RS-232 port
USB headset

Kcriqui,
Was your problem solved? I would be interested to know how.
I have exactly the same problem. When booting up my system (HTPC use), the bios hangs with 92 in the bottom right of the screen.
I have read that it could be linked to USB drives that are connected to the motherboard. I have the following configuration:
MB: H67MA-E45
CPU: i3-2100
GPU: Sapphire Radeon HD 6670
RAM: DDR3-1333 Geil 8GB
HDD: SSD Intel X25-M G2 80GB (system)
HDD: Samsung F1 Spinpoint 500GB (storage)
PSU: Antec EarthWatts 430W
OS: Windows 7 x64 Home Premium
Case: Antec Fusion Remote Black with LCD Display connected to MB via internal USB
This last point is important because this seems to be the cause of the bios freeze at '92' code. When disconnected, the PC just boots fine whereas, if connected, the PC freezes at boot. However, to make it more difficult, this does not happen all the time. When boot freezes, I have to switch off the PC and even switch off the PSU. Then, the PC boots up most of the time.
On the opposite, PC cannot be restarted when windows has started.
After PC boots up fine with LCD disconnected and then LCD is reconnected, the LCD starts up and PC works fine. This proves that LCD display is not broken and works fine.
I cleared the BIOS, but without any success. Problem still occurs.
I have also deactivated any USB boot option so that the PC can only boot onto the SSD.
Could someone help me on this? Did I miss something?
Thanks already for your input.
Hypramaki

New install hangs on boot when GDM or LXDM services are enabled

Greetings Arch users,
I've been trying out installing Arch on a USB drive in order to get familiar with the process and use it on my main machine in the future. I've been following the Beginners' Guide, and after a few hiccups, I managed to install what appears to be a fully-functional Arch system onto a 16 GB USB drive, albeit without a window manager or desktop environment.
When I tried that is where I ran into problems. I installed X, vesa driver, and GNOME and enabled gdm.service, and upon the next reboot the system hung after or in the middle of the fsck process, exactly as described in this thread.
rebooted, hangs after the fsck bit where it says something like /dev/sda4: clean, 112977/9296096 files, 185427/21217024 blocks
I just get the blinking cursor. I left it there long enough to take a nap and nothing else came up.
Examining the journalctl output, I see an error exactly like mentioned in this thread:
GLib-GObject-CRITICAL: g_object_ref: assertion 'object->refcount > 0' failed
GLib-GObject-CRITICAL: g_object_unref: assertion 'object->refcount > 0' failed
Chrooting into the system and disabling gdm.service allowed for normal boot.
Well, I thought, maybe there's an issue with GDM or GNOME. I'll try LXDE and LXDM instead. Unfortunately, that hung at the exact same point in the loading process. Looking at the journalctl, I saw an output exactly like what was described in this thread:
Lxdm.service main process exited code=exited status=1/FAILURE
lxdm.service entered failed state
I'm stumped. I've searched and haven't come up with anything. Does anyone have any ideas about what might be the cause? What additional information would be helpful in diagnosing the issue? Thank you for your help.
Last edited by AbortToddlers (2014-01-28 15:06:04)

Neburski wrote:
slowpoke1584 wrote:
killall gdm
GDM then restarts immediately. Problem recurring each boot.
Can you check the logs (dmesg, journalctl, xorg) and see if there are any differences for the startup of GDM before and after a successful GDM start.
Technically from the lack of information you provided it's not possible to state if you actually have the same issue or not. It might be better for you to start your own separate thread.
If you start your separate thread please provide some more details so people don't need to start guessing.
I think I'll just RTM.

MBA Restart hangs at 50%. Fails to Boot.

I have a MBA mid 2012. Restart fails at around 50%. By rebooting to recover mode I am able (sometimes) to restart via option in Recover mode.

I am only able to get back to Yosemite if I use the recovery partition and start up by selecting "Boot Disk"; choosing "Restart" does not work (or something like that). I can then get back, and restart works normally; at least for a while, and then it fails again, and I need to go back Recovery startup mode and start over again. I have checked the logs, and note the following entry when the reboot hangs:
12/23/14 11:50:24.913 PM configd[26]: timed out waiting for IOKit to quiesce
Busy services :
MacBookAir5,1 [2, 63604 ms]
MacBookAir5,1/AppleACPIPlatformExpert [2, 60785 ms]
MacBookAir5,1/AppleACPIPlatformExpert/CPU0@0 [1, 59607 ms]
MacBookAir5,1/AppleACPIPlatformExpert/CPU0@0/AppleACPICPU [1, 59567 ms]
MacBookAir5,1/AppleACPIPlatformExpert/CPU0@0/AppleACPICPU/X86PlatformPlugin [!registered, !matched, 1, 59324 ms]
MacBookAir5,1/AppleACPIPlatformExpert/PCI0@0 [1, 60722 ms]
MacBookAir5,1/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI [3, 60698 ms]
MacBookAir5,1/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/MCHC@0 [1, 59576 ms]
MacBookAir5,1/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/IGPU@2 [1, 59572 ms]
MacBookAir5,1/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/LPCB@1F [2, 59578 ms]
MacBookAir5,1/IOResources [1, 60379 ms]
com.apple.message.domain: com.apple.SystemConfiguration.InterfaceNamer
com.apple.message.signature: timed out waiting for IOKit to quiesce
com.apple.message.result: failure
SenderMachUUID: 49A88C9C-F94E-3386-A96A-9B5F27F6C7D2
Something about "IOKit" times out. Not sure whta that all means or whether its important.
Paul M

Yosemite lost its ID after reboot?

I wonder if anyone else experienced what just happened to me.
Every time I connected my iphone or ipad I got the question if I trust this computer, over and over again, so I thought I will reboot to see if that would solve the issue. The reboot hang, so powerbutton was the only solution. After bootup, which took a while, I was asked to login to Icloud, Imessages and so on, to everything which require a password. Afterwards I got email saying that my old macbook now also using this and that. It is like the system lost its device ID. Any ideas what happened here?
/Chris

Back up all data before proceeding.
Launch the Keychain Access application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Keychain Access in the icon grid.
Select the login keychain from the list on the left side of the Keychain Access window. If your default keychain has a different name, select that.
If the lock icon in the top left corner of the window shows that the keychain is locked, click to unlock it. You'll be prompted for the keychain password, which is the same as your login password, unless you've changed it.
Right-click or control-click the login entry in the list. From the menu that pops up, select
          Change Settings for Keychain "login"
In the sheet that opens, uncheck both boxes, if not already unchecked.
From the menu bar, select
          Keychain Access ▹ Preferences... ▹ First Aid
There are four checkboxes in the window that opens. Check all of them. if they're not already checked. Close the window.
Select
          Keychain Access ▹ Keychain First Aid
from the menu bar and repair the keychain. Quit Keychain Access.

Unable to shutdown SQL Server

Hello,
I'm facing an issue with a SQL Server 2008 SP3 CU17 setup on Windows Server 2008 R2 SP1.
I've got 4 instances running on this server. A bunch of users make some queries with SSMS (I know it's not really advised...) and from time to time, the instance becomes unavailable.
If I try to restart the instance, it shuts down and never restarts. When looking task manager, I still can see the process of the instance I've just tried to restart, and I'm not able to kill this process.
The only solution remaining is a reboot of the server. But the reboot hangs until a BSOD involving a broadcom faulty driver.
On The advice of Dell Support, I've updated every drivers and firmware but the issue is still there.
The event viewer also show a message about registry file still in use involving sqlservr.exe.
Disk check on the host does not show any hardware issue.
Everything was working fine until one day, when a user came and told me he cannot access the instance anymore. No updates were applied just before the issue appeared.
SQL data are stored on a SAN and when I don't start SQL, reboot of the server goes just fine.
Does anyone has an advice?
Thanks,
Steph

Hi Olaf, Tom, Santosh
I've registered the SPN with setspn.exe but it did not help with the issue.
When the instance "stops", I'm not able to login anymore. I need to check for swapping, as CPU is not a 100%.
The instances are hosted on a physical server, Dell R610.
The results of SELECT @@VERSION is: "Microsoft SQL Server 2008 (SP3) - 10.0.5861.0 (X64) May 6 2014 18:21:57 Copyright (c) 1988-2008 Microsoft Corporation Enterprise Edition (64-bit) on Windows NT 6.1 <X64> (Build
7601: Service Pack 1)"
Users told me that queries were complex and used to validate data between tables.
The page file is Windows managed and 98Gb are currently allocated.
Disk usage isn't easy to monitor as it's in fact iSCSI disks mapped to folders. This is the bandwith percentage for both iSCSI NIC:
https://onedrive.live.com/redir?resid=7DD3E9422D01FAC9!2824&authkey=!ALjdrvp1tbkMp9Q&v=3&ithint=photo%2c.png
And here are CPU and RAM usage:
https://onedrive.live.com/redir?resid=7DD3E9422D01FAC9!2826&authkey=!AP61Pe0d3ZVrDJs&v=3&ithint=photo%2c.png
I will check with DAC next time the server hangs.
Thanks guys,
Steph

Unable to recover Mavericks via Time Machine on iMac (2011). I have one Time Machine backup from this week On new Time Capsule. I already attempted safe boot and NPRAM reset. Hard drive and permissions verified as ok.

Some more history - I'm not too techie so added everything in I thought might be significant!
- Installed Mavericks on iMac in October 2013
- experienced regular low memory issues - used Memory Clean app as a workaround
- last week decided to upgrade installed memory from 4gb to 16gb. Faster loading but still running out of memory - just takes longer to do so.
- also last week purchased 2gb Time Capsule (to back up 660gb on 1TB drive)
- one successful Time Machine backup completed last weekend.
- I decided to try and clear some space, tidy my folders, old music files, delete duplicates etc (Not system files)
- then tried out 'time machine restore' just to test it out. Deleted files and folders recovered ok using Time Machine menu (the one that looks like outta space)
- yesterday, Avast Anti-Virus flagged virus detected (sorry, I didn't manage to capture details) and quarantined file, but I couldn't get any windows to respond so forced Mac to shutdown.
- attempted regular reboot , system hanging on white/ apple symbol screen.
- attempted Safe reboot - reboot stalls at mess 'BootCacheControl: unable to open /var/db/BootCache.playlist no such file or directory.
(I don't know if this is significant)
- attempt NPRAM reset, reboot hanging at Apple symbol still
- attempted reboot into Disk Utility. HD drive verified ok. Permissions checked and Safari permissions fixed (only)
- finally attempting restore from Time Machine Backup via Disk Utility. Stalls at 'select a backup source'. Menu is 'searching for Time Machine Backup....'
Nothing is listed, after a few mins machine just goes to sleep.
My Time Capsule and networks are all switched on. No idea what to try next!

Most of the problems like this that people report on this forum are due to bad "utilities" like Memory Clean and Avast.
Your Mac probably didn't have a virus. There has never been an OSX virus "in the wild". Third party antivirus software is of very dubious utility on Macs. Macs are not PCs. OSX has anti-malware protection built into it already.
Do you have any other third party "utilities" on your Mac, such as CleanMyMac or MacKeeper?
Is the RAM you installed the recommended type of RAM for your Mac?
Take a look at this page: Mac OS X: Gray screen appears during startup
But your OS may be damaged beyond repair, or beyond what disk utility is able to repair.
In that case you have a few options:
There is a small chance that a (reputable) third part utility like Techtool Pro 7 may be able to fix your OS.
Try to boot into single user mode (restart, hold down ⌘S until you see a black screen with white text) and repair your hard drive. Here's a reference with directions: Repair Your Hard Disk in Single User Mode | Everything Macintosh
bite the bullet, boot into the recovery partition or internet recovery, and erase your HD, reinstall Mavericks from scratch, and start over. Your documents are probably still on your Time Machine Backup. I wouldn't reinstall the documents via a migration- you don't want to reinstall bad system files along with your documents- but you could copy them one by one back to your internal HD. And most importantly- don't reinstall any third party "utilites" like Memory Clean or Avast (or any other third-party antivirus software, for that matter).

Reboot hang

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