KT4AV - Spontaneous Power Down

Hi There,
I recently bought a new KT4AV with a XP2400 for my parents, popped it into the case and tried to install WinXP. XP installed no problem, but then I found the pc would just switch off of its own accord. I checked all the usual things, cpu seated correctly, fan fitted correctly, RAM ok, etc... Then came over here and read the first topic regarding Q-Tec psu's... Yep, it has a Q-Tec.
The psu in the machine is the 400w dual fan model, which from reading all of the posts on this forum, sounds as if it is this which might be causing my problems... I just wanted to know whether others thought this was the root of my problem, before I go out and buy a new one.
If the forum thinks that it is the psu, how do you guys rate the following models:
Thermaltake Silent 420W ATX PSU Dual Fan - Manufacturer Code: W0008RE
FSP (Sparkle Power) 350W ATX Passive PFC - Manufacturer Code: FSP350-60PN
They are both fairly similar in price, and both appear to offer the recommended amp ratings and combined wattage... but other opinions are welcome.
FYI, the set-up is as follows:
XP2400,
256 PC2700 DDR RAM,
GeForce4 MX440,
Diamond Supra Express 56k modem,
Seagate 5400 rpm drive (I forget which one...)
floppy,
Lite-on 16x CD-RW,
and er, thats it... of course I am using the on-board sound and ethernet, although I am planning on disabling the ethernet port once I deliver the pc to my folks as they don't have broadband....
I originally thought that the 400w psu would have been more than enough...
Your thoughts and recommendations most welcome!
Regards,
Flak

Hi, Wonkanoby, Bas, et al,
Ok, I have a couple of figures (mainly of different psu's, please recommend one) for ya....
Antec Truepower 330
+5v +12v +3.3v
30A 17A 28A
5+3.3=12 combined= 10W
Antec SL450
+5v +12v +3.3v
40A 20A 28A
5+3.3=240W, 5+3.3+12=380W
Hiper 350 (Never heard of 'em, but the following from http://www.hiper-pc.com/static/products.html and are apparantly max loadings...)
+5v +12v +3.3v
35A 15A 28A
5+3.3=175W, 5+3.3+12=330W
And finally Hiper 420
+5v +12v +3.3v
28A 16A 48A 5+3.3=210, 5+3.3+12=400W
Those last two are fairly cheap (around the same price as the crappy Q-Tec I bought originally. I do think that the last 3.3v is a typo, tho.... 48A?!!
I would appreciate your recommendations on these psu's (I won't sue if they are pants!) as you obviosuly have quite a bit more experience with MSI boards than I ;o)
How do these comapre to the Enermax 365?
I have an Enermax 365 in my rig, I am about to try it in the poorly pc, but are any of those psu's signifcantly better than the Enermax? If they are, I might use this opportunity to upgrade mine.... and give my folks my old Enermax, bearing in mind that my folks don't do much other than check e-mail, play Solitaire and my old man occasionally has a blast on NFS5.....
TIA, guys.... very good forum this!
fM
to add another couple of psu's... thought that whilst I was at it, I might as well ask for the world...;o)

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Wed Mar 18 23:15:05 2015
*** Panic Report ***
panic(cpu 0 caller 0xffffff800a41a46e): Kernel trap at 0xffffff800a8e9774, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0x0000000000000000, CR3: 0x000000000d7ff000, CR4: 0x00000000001626e0
RAX: 0x0000000000070001, RBX: 0xffffff8029f0d800, RCX: 0x666b395f8805008e, RDX: 0xffffff81c9b43088
RSP: 0xffffff81f7753e90, RBP: 0xffffff81f7753e90, RSI: 0xffffff81c9b43068, RDI: 0x0000000000000000
R8: 0x0000000000987455, R9: 0xffffff800aa95740, R10: 0x00000416191ecb44, R11: 0x00000416188656ef
R12: 0xffffff81f7753f50, R13: 0xffffff7f8cfdf044, R14: 0xffffff7f8cff5978, R15: 0xffffff800aad66c0
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Fault CR2: 0x0000000000000000, Error code: 0x0000000000000000, Fault CPU: 0x0
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0xffffff81f7753b40 : 0xffffff800a32fe41
0xffffff81f7753bc0 : 0xffffff800a41a46e
0xffffff81f7753d80 : 0xffffff800a436683
0xffffff81f7753da0 : 0xffffff800a8e9774
0xffffff81f7753e90 : 0xffffff7f8cfdf267
0xffffff81f7753eb0 : 0xffffff7f8cfe2ad7
0xffffff81f7753ee0 : 0xffffff7f8cfdf1ed
0xffffff81f7753f00 : 0xffffff800a3624f9
0xffffff81f7753fb0 : 0xffffff800a414dd7
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         com.apple.driver.AppleAHCIPort(3.1)[93E1D2EC-50EE-3340-9676-0EA1E0B1AD45]@0xffffff7f8cfdb000->0xffffff7f8cff5fff
            dependency: com.apple.iokit.IOAHCIFamily(2.7.5)[DAF0353B-16D5-385A-A0F3-FD5CF3BA07F2]@0xffffff7f8bc17000
            dependency: com.apple.iokit.IOPCIFamily(2.9)[56AD16B5-4F29-3F74-93E7-D492B3966DE2]@0xffffff7f8ab9b000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
14C1510
Kernel version:
Darwin Kernel Version 14.1.0: Thu Feb 26 19:26:47 PST 2015; root:xnu-2782.10.73~1/RELEASE_X86_64
Kernel UUID: [snip]
Kernel slide:     0x000000000a000000
Kernel text base: 0xffffff800a200000
__HIB text base: 0xffffff800a100000
System model name: iMac13,2 (Mac-FC02E91DDD3FA6A4)
System uptime in nanoseconds: 4492947384197
last loaded kext at 1200852616389: com.apple.filesystems.smbfs     3.0.0 (addr 0xffffff7f8d0f5000, size 389120)
last unloaded kext at 368737361800: com.apple.filesystems.msdosfs     1.10 (addr 0xffffff7f8d0f5000, size 61440)
loaded kexts:
com.globaldelight.driver.VoilaDevice     1.1
com.paceap.kext.pacesupport.snowleopard     5.9.1
de.rme-audio.driver.RMEFirefaceUSB     2.04
at.obdev.nke.LittleSnitch     4234
[snip]
Model: iMac13,2, BootROM IM131.010A.B05, 4 processors, Intel Core i7, 3.4 GHz, 16 GB, SMC 2.11f14
Graphics: NVIDIA GeForce GTX 680MX, NVIDIA GeForce GTX 680MX, PCIe, 2048 MB
Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1600 MHz, 0x02FE, 0x45424A3831554738424255352D474E2D4620
Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1600 MHz, 0x02FE, 0x45424A3831554738424255352D474E2D4620
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xF4), Broadcom BCM43xx 1.0 (7.15.159.13.12)
Bluetooth: Version 4.3.2f6 15235, 3 services, 19 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en0
Serial ATA Device: APPLE SSD SM768E, 751.28 GB
USB Device: Rugged Mini USB 3.0
USB Device: XD-0608-U
USB Device: Hub
USB Device: Babyface (23189963)
USB Device: Keyboard Hub
USB Device: Apple Keyboard
USB Device: FaceTime HD Camera (Built-in)
USB Device: Hub
USB Device: Hub
USB Device: BRCM20702 Hub
USB Device: Bluetooth USB Host Controller
Thunderbolt Bus: iMac, Apple Inc., 23.4

Thanks Linc, that's good to know.
I'll carry on using my workaround (disconnecting the Thunderbolt cable before I power down the drive), until the next version of Yosemite is released; then I'll test again.

My ipad will not completely shut off. If I try to power down, it reboots on its own.

When I hold the sleep button down to power off my ipad, I get the red slide that confirms that I want to power down. I slide it like I always have, but once it shuts down, it immediately reboots. I can't get it to shut off completely.

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Internal iMac hard drive keeps trying to power down without my consent

How do you stop an internal hard drive from shutting down when you didn't ask it to?
Background:
I use Missing Sync for Palm to sync my Palm handheld with my iMac. My Palm has a SD card slot it in and the sync software came with a program that allows me to mount the
SD card as an external drive on my iMac. From there, I can add podcasts, music or whatever I want directly to the card. I have used this software since March with no problems.
Also, when you put my computer to sleep or shut it down, there is a click and then the internal hard drive shuts down.
Last night, I activated the program to mount the SD card to my iMac and instead of it mounting, the iMac's internal hard drive started trying to shut down.
I have used this program many, many times to mount the SD card to my iMac with absolutely no problem. It was weird this time because I kept hearing that clicking noise. The computer became extremely sluggish. To me, it appeared that the internal hard drive was trying to shut down. After about 4-5 clicks, it succeeded and the computer froze.
Since that time, shortly after you turn the iMac on, you hear that clicking noise trying to power down the hard drive. Sometimes, it just takes a few clicks and the hard drive shuts off. Sometimes the computer will boot all the way up, I can log in and launch a program before it shuts off and the computer freezes. While I can't check the drive with First Aid or Diskwarrior because it shuts off before I can scan it, I assume the data and the drive are ok because I have been able to successfully boot from it and log into my account but shortly after I log in, the hard drive shuts down and the computer is stuck.
Any ideas? Any help would be wonderful!

You are right. It is failing. I took my Mac into the Apple Store and talked with a genius. Although the hard drive would not do what it had at home (typical when you're trying to get something diagnosed) I shut it down so he could hear the noise I do.
Sure enough, he said the noise I heard was the drive read head hitting its start position. When a hard drive shuts down, the drive head moves out of the way since the "hard disk" is actually a thin floppy magnetic disc. The noise I kept hearing was indeed the drive trying to shut down.
Fortunately, I did make a clone of my internal drive to that external drive 6 months ago so I was (eventually) able to copy over all the important files, update the external clone and boot off of it.
Sure enough, tonight, I opened Disk Utility and it said in plain red letters that the drive had reported a hardware failure and should be replaced.
Since my iMac is Summer 2001, the Mac Genius said they no longer carry parts for it so he gave me the name of a local place that would be glad to fix it up. I called them and luck would have it that they were completely out of the internal drives used by my model iMac. So I have to check next week to see if they have received more in yet.
The good news is I can get a slightly larger interal hard drive since I was down to 10GB of a 60GB factory drive. So far, I hear I can go as high as 160GB but the RPM must be lower since my iMac has no fans.
Thanks for your help! As much as I didn't want to believe it, you hit the problem right on.

KT4AV - Spontaneous Power Down

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