My imac shuts down during the load up screen?

So I just got home and I realized the power was out. I bought this iMac literally like two months ago (I actually bought one two months ago but it wouldn't even turn on so they gave me a new one) It was working perfectly fine, and I was writing a report. I left the computer on and left the house only to return hours later with the power out, and when I turn it on it shows the start up screen with the Apple Logo, the little progress circle, and a progress bar that fills up to the end everytime but once it fills up to the end it stays there for a few minutes then the computer shuts off.
What should I do? I'm not tech expert please help, if it's possible I would really like to recover that report document, I need it by tomorrow!! Please help!!
Regarding Time Machine, no I don't know what it is or how to use it, so I don't think there would be any backup from it I could use.
Thank you!!
I appologize I don't know how the categories work here!

The same happened to me a few weeks ago on my iMac (2008 24" 2.8 GHz model). I attempted another boot cycle to go into safe mode while viewing the lines. What you're not seeing when the progress bar is filling is your iMac attempting 3 tries to boot. After the third try, if unsuccessful, it will power down.
There's a couple things you might want to try first:
1) Unplug everything from the iMac but your USB keyboard and mouse and try booting again;
2) Assuming you're running OS X and beyond, attempt booting into safe mode using these instructions: OS X: What is Safe Boot, Safe Mode? ; or otherwise, if running Mavericks: OS X Mavericks: Start up in safe mode
In my case, I never got that far because it still wouldn't boot up. I had to take in into the shop so they could diagnose the problem. It turns out, in my case, the power supply was faulty and had caused issues with the hard drive. I had an older backup, but at this point, Apple no longer has parts available for my 5 year old iMac (which is quite a crappy deal). We examined my options and I decided that I'll be searching outward for another power supply and new hard drive and doing the replacement myself (even if I have to cannibalize another old iMac). Bonus is I'm in the market for a Macbook Pro now.
l can't say this would be your issue, as there are others that can cause a boot failure; however, if no other info comes your way to help you out, it might likely require a visit to an Apple shop for diagnosis.

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Hello canwary
Good job on troubleshooting your issue so far. For most issues that deal with your Mac not starting up, consult the article below to see what the issue could be.
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http://support.apple.com/en-us/TS2570
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Anonymous UUID:       AB81CF7F-300F-0F23-BA20-B5C00F522753
Sun May 4 07:52:49 2014
panic(cpu 0 caller 0xffffff800a6c020b): "TLB invalidation IPI timeout: " "CPU(s) failed to respond to interrupts, unresponsive CPU bitmap: 0x6, NMIPI acks: orig: 0x0, now: 0x0"@/SourceCache/xnu/xnu-2422.92.1/osfmk/x86_64/pmap.c:2612
Backtrace (CPU 0), Frame : Return Address
0xffffff81dae7b050 : 0xffffff800a622fa9
0xffffff81dae7b0d0 : 0xffffff800a6c020b
0xffffff81dae7b160 : 0xffffff800a6c51e3
0xffffff81dae7b240 : 0xffffff800a6c5cd7
0xffffff81dae7b2a0 : 0xffffff800a67e464
0xffffff81dae7b3b0 : 0xffffff800a6822df
0xffffff81dae7b3e0 : 0xffffff800a67c274
0xffffff81dae7b410 : 0xffffff800a803e74
0xffffff81dae7b440 : 0xffffff800a803fd6
0xffffff81dae7b460 : 0xffffff800a9817d3
0xffffff81dae7b490 : 0xffffff800a96ee43
0xffffff81dae7b550 : 0xffffff800a96c130
0xffffff81dae7b5b0 : 0xffffff800a984cb2
0xffffff81dae7b610 : 0xffffff800a7fc756
0xffffff81dae7b9e0 : 0xffffff800a7fc646
0xffffff81dae7ba20 : 0xffffff800a7de60f
0xffffff81dae7bb80 : 0xffffff800a7e65b2
0xffffff81dae7bc30 : 0xffffff800a7e6ce2
0xffffff81dae7bf50 : 0xffffff800aa3e413
0xffffff81dae7bfb0 : 0xffffff800a6f3b76
BSD process name corresponding to current thread: CalendarAgent
Mac OS version:
13C1021
Kernel version:
Darwin Kernel Version 13.1.0: Wed Apr 2 23:52:02 PDT 2014; root:xnu-2422.92.1~2/RELEASE_X86_64
Kernel UUID: E9CF78E2-1E9F-3B6F-81A4-FEE6C6D0E4D5
Kernel slide:     0x000000000a400000
Kernel text base: 0xffffff800a600000
System model name: iMac11,3 (Mac-F2238BAE)
System uptime in nanoseconds: 59470396764246
last loaded kext at 52110826751224: com.apple.driver.AppleIntelMCEReporter          104 (addr 0xffffff7f8ccbc000, size 49152)
last unloaded kext at 44657134745411: com.apple.driver.AppleIntelMCEReporter          104 (addr 0xffffff7f8ccbc000, size 32768)
loaded kexts:
com.aladdin.kext.aksfridge          1.0.2
com.symantec.kext.SymAPComm          12.6.1f9
com.symantec.kext.fw          5.3.1f9
com.symantec.kext.ips          3.9.2f1
com.symantec.kext.pf          5.6.1f9
com.symantec.kext.internetSecurity          5.3.1f8
com.apple.driver.AppleIntelMCEReporter          104
com.apple.filesystems.autofs          3.0
com.apple.driver.AppleHWSensor          1.9.5d0
com.apple.iokit.IOBluetoothSerialManager          4.2.3f10
com.apple.driver.AGPM          100.14.15
com.apple.driver.AudioAUUC          1.60
com.apple.driver.AppleMikeyHIDDriver          124
com.apple.driver.AppleMikeyDriver          2.6.0f1
com.apple.driver.AppleHDA          2.6.0f1
com.apple.driver.AppleUpstreamUserClient          3.5.13
com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
com.apple.kext.AMDFramebuffer          1.2.0
com.apple.driver.AppleBacklight          170.3.5
com.apple.driver.AppleMCCSControl          1.1.12
com.apple.driver.AppleLPC          1.7.0
com.apple.AMDRadeonX3000          1.2.0
com.apple.kext.AMD5000Controller          1.2.0
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport          4.2.3f10
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AppleHWAccess          1
com.apple.driver.Oxford_Semi          3.4.1
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          35
com.apple.driver.AppleUSBCardReader          3.4.1
com.apple.driver.AppleIRController          325.7
com.apple.iokit.SCSITaskUserClient          3.6.6
com.apple.driver.XsanFilter          404
com.apple.iokit.IOAHCIBlockStorage          2.5.1
com.apple.driver.AppleUSBHub          666.4.0
com.apple.driver.AppleFWOHCI          4.9.9
com.apple.driver.AirPort.Atheros40          700.74.5
com.apple.iokit.AppleBCM5701Ethernet          3.8.1b2
com.apple.driver.AppleAHCIPort          3.0.0
com.apple.driver.AppleUSBEHCI          660.4.0
com.apple.driver.AppleRTC          2.0
com.apple.driver.AppleACPIButtons          2.0
com.apple.driver.AppleHPET          1.8
com.apple.driver.AppleSMBIOS          2.1
com.apple.driver.AppleACPIEC          2.0
com.apple.driver.AppleAPIC          1.7
com.apple.driver.AppleIntelCPUPowerManagementClient          216.0.0
com.apple.nke.applicationfirewall          153
com.apple.security.quarantine          3
com.apple.driver.AppleIntelCPUPowerManagement          216.0.0
com.apple.kext.triggers          1.0
com.apple.iokit.IOSerialFamily          10.0.7
com.apple.driver.DspFuncLib          2.6.0f1
com.apple.vecLib.kext          1.0.0
com.apple.driver.IOPlatformPluginLegacy          1.0.0
com.apple.driver.AppleUSBAudio          2.9.5f4
com.apple.iokit.IOAudioFamily          1.9.5fc2
com.apple.kext.OSvKernDSPLib          1.14
com.apple.driver.AppleSMBusPCI          1.0.12d1
com.apple.iokit.IOFireWireIP          2.2.6
com.apple.driver.AppleHDAController          2.6.0f1
com.apple.iokit.IOHDAFamily          2.6.0f1
com.apple.driver.AppleBacklightExpert          1.0.4
com.apple.driver.AppleSMBusController          1.0.11d1
com.apple.driver.IOPlatformPluginFamily          5.7.0d10
com.apple.iokit.IONDRVSupport          2.4.1
com.apple.iokit.IOAcceleratorFamily          98.14
com.apple.kext.AMDSupport          1.2.0
com.apple.AppleGraphicsDeviceControl          3.4.35
com.apple.iokit.IOBluetoothHostControllerUSBTransport          4.2.3f10
com.apple.iokit.IOSurface          91
com.apple.iokit.IOGraphicsFamily          2.4.1
com.apple.iokit.IOBluetoothFamily          4.2.3f10
com.apple.driver.AppleSMC          3.1.8
com.apple.driver.AppleUSBHIDKeyboard          170.15
com.apple.driver.AppleHIDKeyboard          170.15
com.apple.iokit.IOFireWire
Model: iMac11,3, BootROM IM112.0057.B01, 4 processors, Intel Core i5, 2.8 GHz, 16 GB, SMC 1.59f2
Graphics: ATI Radeon HD 5750, ATI Radeon HD 5750, PCIe, 1024 MB
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x857F, 0x483634353155363446393333334700000000
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x857F, 0x483634353155363446393333334700000000
Memory Module: BANK 0/DIMM1, 4 GB, DDR3, 1333 MHz, 0x857F, 0x483634353155363446393333334700000000
Memory Module: BANK 1/DIMM1, 4 GB, DDR3, 1333 MHz, 0x857F, 0x483634353155363446393333334700000000
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x8F), Atheros 9280: 4.0.74.0-P2P
Bluetooth: Version 4.2.3f10 13477, 3 services, 23 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: WDC WD1001FALS-40Y6A0, 1 TB
Serial ATA Device: HL-DT-STDVDRW GA32N
USB Device: Hub
USB Device: USB2.0 Hub
USB Device: Matias Keyboard
USB Device: Built-in iSight
USB Device: IR Receiver
USB Device: Hub
USB Device: USB 2.0 Hub [MTT]
USB Device: Bose SoundLink Audio
USB Device: USB 2.0 Hub
USB Device: SDDR-113
USB Device: USB OPTICAL MOUSE
USB Device: Internal Memory Card Reader
USB Device: BRCM2046 Hub
USB Device: Bluetooth USB Host Controller
FireWire Device: Elite Pro U3FW, OWC, Up to 800 Mb/sec
Thunderbolt Bus:

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
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. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

24" Imac shuts down during startup, HD replaced

So my iMac (running Mavericks) was running really slow and wouldn't respond often. It got to the point where it was freezing up or getting the spinning wheel all the time. I assume the HD was failing and bought a new one. I originally had a WD SATA 1TB drive in it (original from apple) So I basically ordered the same thing from Amazon. A WD SATA 1TB. I followed all instructions on iFixit for HD replacement. Overall the installation went fine. Not my first time under the hood of one of my Macs. I ran the recovery mode, formatted the new drive and restored from the time machine backup. All going smoothly. Now when it boots I get the gray screen, apple logo, spinning gear then complete shut down. Zapped PRAM, rest SMC. I'm at a total loss what to do next. PLEASE HELP!!

Try to boot up in Safe Mode. Hold down the "Shift" key as soon as you turn on the computer. This will force a check of the directory, turn off extensions and login items and more.
If that doesn't work, I recommend booting from the Mac OS X install disk and using disk utility to check the drive. Slide the install disk in the drive and then restart holding down the "C" key. Keep holding it down until it is booted up. From the menu select "Disk Utility", then highlight the hard drive, then click "Repair Volume".
Lastly, if that doesn't work - go get a copy of DiskWarrior which is known to fix just about any hard drive problem. Everybody should have a copy of this on hand anyway.
Good luck!!

IMac shuts down at the end of safe reboot?

My 27 IMac failed to get past start up grey screen. I shut down, pulled all external
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Have you tried booting into the Recovery HD and running Disk Utility to see if the HD needs any repairs?
Restart holding down Command + r
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IMac shuts down during startup

My 1.8GHz 20" iMac G5 will shut down soon after I hit the power button. Sometimes I get a grey screen for a few seconds before it shuts down and other times I only see the power light before it shuts down. You can hear things running but I am not sure if it is the fan, hard drive or both.
I took the back off and the first three LED's seem to check out okay. I also reset the PRAM to no avail.
My iMac had been in storage for a while and seemed to boot fine when I first tried. I plugged a portable hard drive into one of the USB jacks on the keyboard and got an error message about USB overcurrent. Before I could even finish reading the message and react to it the machine shut down and hasn't been able to start ever since.
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"My iMac had been in storage for a while"
How long? It's possible you may need a new battery?
The CR2032 battery can be purchased/ordered for under $10.00 from: http://mac-batteries.com/
CR2032

IMac shuts down during Mac OS X Bootcamp Installation PLEASE HELP!!

Hi,
Just opened my new iMac and have installed Windows XP Professional SP 2. I have inserted the Mac OS X installation disc, per the instructions, but Boot Camp won't install in Windows! It looks like it is going to copy files, but then it just shuts down all of a sudden and reboots to Windows. Once it is rebooted, there is a "critical error" message - yikes! I wish I didn't need Windows on my new Mac, but I have to have it for work. Please please please help.
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Sounds like the new iMac may not support XP. Someone was curious about XP support on MBP today also.
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http://www.apple.com/support/bootcamp

My imac shuts down during the load up screen?

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