Intel iMac freezes, reboots and other issues

Intel iMac 17" 1.83 Ghz model (Had for a while now)
1 GB of 667 MHz DDR2 SDRAM installed (Mac detects this fine)
Mac OS X 10.4.8
Beginning yesterday, the Mac froze when shutting World of Warcraft (which had been installed and working for at least two months). Computer completely hung. Restarted machine.
A few minutes later, the machine just switched itself off (or appeared to) - screen goes black. I held in power button for five seconds until I heard a click in the machine. This has happened repeatedly.
One time, the machine froze and the monitor refreshed at a visible rate (I could see the scan line) - each time the screen got darker.
Often, it will turn on, but the OS won't load unless I hold Alt down, or if I use OptionAlt+PR.
Ran disk utility from the install disk, only minor issues, all fixed. The problem of turning off still occurred.
Nothing in the kernel panic log. Diagnostics in System Profiler is saying it passes on the power on self test.
The confusing thing is, that after last night, I pulled the plug out, went to bed, praying to the computer fairy to fix it. This morning, it ran fine continuously for about 8 hours, running WoW, IRC app, iTunes etc. all fine.
Could it be a power supply issue? Is the thing overheating (the Mac is up to date with EFI Firmware update and SFC Firmware update).
I'm utterly stumped as to what's causing it. I don't want to send the thing off as then I'm without a computer.
Any ideas or advice?

Has it done it since?

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When I got the laptop back, the sheet inside said they had replaced the Speaker because of Distorted Sound. This was not even on the list even though I had noticed it. I didn't even power up the laptop before calling them again - yes, I was furious! Plus our power was out...
So this was noon on the 14th. They opened case #3 and sent me ANOTHER BOX so I could send it back.
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So, he sent me ANOTHER BOX. I've built up quite a stack of them.
Our power was out AGAIN from the 17th through the 19th (don't get me started).
I noticed a hardware scan had now gotten a failure on the main hard drive. So I called them on the 21st to add this to the case before sending the laptop back. The girl said they can't add anything to an existing case or edit it at all once it's opened. She would have to open a new case and SEND ME ANOTHER BOX. I told her to forget it because I was ready to send it in and didn't want to wait for another box. I also asked for a status on that "escalation case" where the supervisor was supposed to call me. In order to do this she, yes, wait for it, had to open ANOTHER CASE!! So they would know I wanted a status. I'm completely dumbfounded.
So I sent it back on the 21st. This time I practically wiped it. I had already removed all my files the last time, but I had left my bookmarks and browser history intact. I set up a guest logon with admin privileges. I updated my letter and printed off more stuff to include with the box. On one sheet I had only the case number, the serial number and machine type. On another sheet I had "DO NOT SEPARATE THIS PAPERWORK FROM THE LAPTOP" and the case number. I put this sheet on top (The guy on the 15th said my letter and stuff may have gotten separated from the laptop once it was delivered to the repair facility). I used a ton of staples so it would all stay together. I included in my letter the failure on the main hard drive and asked if they could look at it. I wrote about having to open a new case if I wanted to include it.
They received it on the 22nd. A nice gentleman from the repair facility called me that day asking about the password. that. was. written. on the sheet they have you fill out. I told him what happened last time and also mentioned the hard drive failure and asked if he could look into it. He said they would.
I received my laptop back yesterday morning.The sheet that came with it said they had "replaced the following parts to complete the repair of your laptop."
Part Description                                           Symptom
IMAGE                                                             Replaced due to engineering change
System board                                                 Network card error
Hard disk drive                                                Network card error
ECA-WIRELESS                                            <no symptom listed>
There was also a sheet saying they had installed a factory preload of software and I needed to install Lenovo and Windows updates.
When I booted it up, the first thing I noticed, in the lower right corner was:
Windows 8.1
SecureBoot isn’t configured correctly
Build 9600
I ran a hardware scan. Well, I tried. It stopped part way through and said it finished successfully but most of the tasks showed up as cancelled. I tried to run it again - issues - rebooting ensued. It said the LSC wasn’t available and that I should try again or reboot.
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collecting some error info, and then we'll restart for you. (xx% complete)
If you'd like to know more, you can search online later for this error: DRIVER_CORRUPTED_EXPOOL
Even though the LSC said my Lenovo files were all up to date, I ran the Update. And first I had to download a new version of Update. Then I downloaded all of the Lenovo updates and installed them (there were quite a few). The BIOS update failed. While I was doing the Lenovo downloads, I got a light blue screen but no text (I was out of the room so I'm not sure what happened). Did CTRL-ALT-DEL and it shows only IE and Task Manager as applications that are running. Could not “Switch to” IE. Hitting window key to go to start didn't do anything. So I had to restart.
By 3pm yesterday there were 34 system events in the configuration history.
I ran the hardware scan again after I updated the Lenovo files, and you guessed it! Failure on the SSD (SMART Short Self-Test) and warning on the wireless. Nothing had changed. Except hardware scan is acting different than it did before I sent in the laptop for repairs. When it finishes, it instantly closes and just shows 100% complete. When I click on "see last results" it shows a screen called
Log Information,
Canceled 04/24/2015 n:nn pm
You have not done a hardware test on your computer
And the calendar in LSC only shows the very first hardware scan I did on Friday. Even the hardware scan screen shows the date and time of the last scan. It also shows the error code. In order to see exactly what is failing, I have to sit there and watch it very closely and snap a picture of the screen as soon as the error (or warning) shows up.
When I would try to run Windows update, it would hang up PC Settings. I couldn't even kill it using task manager because it didn't show up as a task. During this, I got a flag saying the firewall wasn't turned on. I tried to turn it on, but clicking on Turn on Windows Firewall didn't do anything. I tried to setup my Microsoft account but that just hung too.
I ended up running Windows Update FOUR TIMES to get all the updates installed. Every time I ran it, it said "Done!" and I would run it again and more would show up. The last time was this morning.
At some point, the error about SecureBoot went away.
Then, I created a bootable BIOS update disk. Following the ReadMe instructions, I went through ThinkPad Setup and verified several values. Of note:
Secure Boot was DISABLED. According to the ReadMe file, this should be ENABLED in Windows 8.1. I enabled it.
Under Startup/Boot, according to the ReadMe that came with the BIOS update, UEFI/Legacy Boot is supposed to be set at UEFI Only for Windows 8.1. Mine was set to "Both". I changed it.
In Startup, OS Optimized Defaults was DISABLED, even though it says right there (and in the BIOS update ReadMe) it should be ENABLED to meet Microsoft Windows 8 Certification Requirement.
After these updates, I flashed the new BIOS.
Then, I ran hardware scan again...
Now I have TWO failures on the SSD: Random Seek Test and SMART Short Self-Test. Great.
In the Event Viewer (that I recently discovered), it says my disk has a bad block. It just says The device, \Device\Harddisk\DR1, has a bad block. I assume this is the SSD...
There are 867 events in the event viewer - Critical, Error, and Warning...
Fifty-two of these are from October 7, 2013 - before my little laptop was a glimmer.
The rest are from when Lenovo had it and yesterday and today.
64 of them are the disk error.
341 are from DeviceSetupManager. 65 of those are from failed driver installs. 69 are for not being able to establish a connection to the windows update service. 64 are from not being able to establish a connection to the Windows Metadata and Internet Services (WMIS).
3 times it's rebooted without cleanly shutting down
60 of them are from Service Control Manager and say The TDKLIB service failed to start due to the following error: The system cannot find the file specified.
One of them says {Registry Hive Recovered} Registry hive (file): '\??\C:\Users\Default\NTUSER.DAT' was corrupted and it has been recovered. Some data might have been lost.
16 are warnings that various processors in Group 0 are being limited by system firmware.
12 say the certificate for local system with thumbprint <bunch of hex numbers> is about to expire or already expired.
108 are warnings for failure to load the driver \Driver\WUDFRd for various devices
16 are application errors
One is for the computer rebooting from a "bug check"
15 are for name resolutions timing out after none of the configured DNS servers responded.
10 are for SecureBoot being disabled.
14 for services terminating unexpectedly
15 are for WLAN Extensibility Module has stopped
61 are for applications not being able to be restarted because the application SID does not match Conductor SID
12 are for activation of CLSID timing out waiting for the service wuauserv to stop
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I understand that you are having scanning and printing issues after upgrading to Mavericks OS X v10.9.1. I will try my best to help you resolve this issue.
In this document for Mac OS X: Scanning Software Does Not Open or Stops Responding are steps the may help you with your scanning issue.
This document for Fixing Ink Streaks, Faded Prints, and Other Common Print Quality Problems should help with the streaking printing issue.
I hope this information is helpful. Please let me know.
Thank you,
I worked on behalf of HP.

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Message was edited by: geekboy2000 - corrected OS

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Any input appreciated.

Why is my Intel iMac restarting randomly and USB keyboard not working randomly?

My intel iMac has been randomly rebooting itself without any error messages. It also seems to coincide with the keyboard (USB) not working, but not always. At first, it seemed to happen right after waking the computer from sleep, but now it happens when I am just sitting at the computer about once or twice a day. For now, i have temporarily removed all external devices (except time capsule) and disabled any bluetooth or iTunes synch'ing over wifi. I have also disabled all power management features.
I've tried different keyboards and resetting the SMC. Could bad memory cause this?

Could be anything from a loose power cable, to loose or bad RAM module.
1. Check all your power connections, including the mag connector on the back of the iMac.
2. Reinstall the RAM modules, as per > iMac: How to remove or install memory. When installing new or reinstalling RAM, be sure to push firmly on each module with both thumbs to insure that they are fully seated in the slots.
Then if it is still acting up...
3. Run the > Extended Apple Hardware Test

All of a sudden TWO choices for Restart and Shutdown and other issues...

I noticed today that there are now TWO choices in the menu for Restarting and Shutting down for my iMac.
"Restart...
Restart
Shutdown...
Shutdown"
Nothing new has been installed.
Also, now there is a black rectangular outline around anthything that is "selected" on the desktop or in a menu.
My mac mini has also started to act weird all of a sudden. Watching Netflix today, the entire display get s horizontal colored lines and the computer freezes. I have to hold the power switch to turn it off. When trying again, it does the same thing after a few minutes.
Any ideas?
Any help would be appreciated.
Message was edited by: ihans

The imac problems have been solved.
The Voice Over Function in the preferences was turned on somehow. This caused the duplicate restart and shutdown issue, and the black box around highlighted items.
Now If I can figure out the Mac Mini issue. I hope it's not dying on me...
Message was edited by: ihans

Intel iMac freezes, reboots and other issues

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