No firewire after turning of mains power - SMU reset needed to fix

Everytime I turn the mains power off on my 20" G5 imac when I reboot I've lost all my firewire connections. If I do a SMU reset they both come back.
It's a new logic board having been replaced on Apple Care for the overheating and fan problems.
Unfortunately my Apple care has now run out.
I've so far:
1. Replaced the Logic Board battery,
2. Wiped the drive and reinstalled the OS,
3. Zapped the PRAM
4. Reset the NVRAM
5. Reset-all the Open Firmware
6. Swapped the Ram out
I know a lot of people have had similar problems, but none of the fixes work.
Any ideas on what might be causing this problem?
Thanks.

Hi airsine,
The "standard" fix for firewire problems is actually to remove all power to both the computer and the connected FW devices, disconnect the FW devices, wait 15 minutes (sometimes far less is all that is needed) and then fire it all up again. The FW ports have a self resetting fuse that can be reset using the above process. The SMU reset process can "mimic" this process, because it also involves removing power to the computer, though the SMU in theory itself should have no real effect on your FW ports.
I find myself wondering whether the problem is actually occurring not when you turn your system off at the mains, but when you turn it on again. Usually FW problems of this kind turn out to be related to either a problematic device, or combination of devices, dragging too much power, or a bad cable.
Have you tried adding the devices one by one, to see if the problem is related to any particular one of them? You might also want to try using a powered FW hub, as this can overcome problems associated with too much load on the FW port when devices are "daisy chained". What do you actually have connected?
Cheers
Rod

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SMU reset offers temporary fix for lost firewires

So my folks have a 17inch G5 iMac (running Tiger), and they have been experiencing several problems that seemed to originate as a problem with the SMU: failure to go to sleep, failure to wake up, slow start ups, slow shutdowns, faster running of the fan, and finally the loss of data (not power) to the firewires. The final one is the major deal breaker because and for almost two years now my family has been using iChat as our major form of communication.
So I'm home for Thanksgiving and yesterday I reset the SMU, and EVERYTHING was fixed, firewires were back, it was going to sleep, I was hailed as a hero lol... etc...
Tonight when my mom tried to put it to sleep it wouldn't, so I went and checked in the system profiler, and the firewires are gone again.
Should I just reset the SMU again and hope for the best? and if this IS a temporary fix, what's the real problem and how do I fix it?
Any and all help is greatly appreciated.

Here some more stuff you can try:
1. Downloading and installing the combo updater of the system software update you've just applied via "Software Update...".
2. Another trick is to restart each by zapping the parameter RAM:
Zapping the P-RAM:
After the startup tone, hold down <commandd><option><r> until 3 additional startup tones are heard, then release the 4 keys.
3. A 3rd tip would be to do Open Firmware reset:
After the startup tone, hold down <command><option><o><f> until the text screen is visible. When text can be entered, type the following commands, followed by the <return> key (there are no space characters in each command):
reset-nvram
set-defaults
reset-all (the Mac will boot up after this command is entered)
Let us know if you regain your heroic status,

I just purchased the IPad 2 and now when I purchase apps from the App store it says waiting and then dissapears. I have checked for updates and all apps are undated as well as my ios 5. I have turned off the power and reset the system and still nothing.

The free apps and the ones I try to purchase will not download. I have updated all my app and the ios 5 have the most recent updates. I have turned off the system and reset the system and it will still not download the apps. When I purchase an app it ask for password. I put the password in and it say waiting and then the app dissapears. At this point I don't know what to do?

1. Sign out of old ID
2. Reboot
3. Sign in with new ID

Beyond G5 SMU reset - how to fix?

Hi all,
I have a late 2005 G5 dual core 2.0Ghz. It had an unexpected power down on wake, which was fixed by unplugging the power cord for 2 mins.
A month later, it happened again. Then next week, again. I then opened it up and reset the SMU using the button.
A few successful wakes later, it happened again. Pressing the SMU button was the only solution that time.
Next wake did not succeed. An SMU reset was needed.
Now, even an SMU reset will not do the trick.
Question: what can be done to fix this? What could be swapped out? I hope and pray this is not a motherboard issue.
Thanks in advance
Tim
This posting brought to you by my trusty 400Mhz G4 Sawtooth.

Click off coming out of sleep usually means that either the SMU or the PSU (more likely) has detected either an overcurrent or out of specification voltage and has brought the system voltages down as protection. That is a little harder to isolate, so the usual solution is to replace the power supply.
One thing that can contribute to that sort of problem is a buildup of dust and other foreign matter in the power supply, which can create a voltage path that confuses the protective circuitry. This thread from April links to some interesting photos of a G5 supply that became a hutch for a family of dust bunnies. The best way to deal with this is to remove the power supply from the enclosure (see ifixit.com, maybe for instructions, or other places) and then take it outside and direct compressed air into the rear (non-fan) end and then into the fan end. If this hasn't been done before, expect an image similar to some early scenes in The Grapes of Wrath.
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How to clear power up reset states?

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Hey Kuroro,
Usually when you call and run the clear power up reset state program, it should take care of resetting the state of the board. The next step to try is after you have run the clear power up reset state is to initialize the board itself. Go ahead and try to reinitialize the board after you call this clear power reset state program. You can either initialize the board in the Measurement and Automation Explorer, or you can use the function in Labview to do this. You can just use the Initialize Controller VI to do this.
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My bookmarks are lost after turning off the computer unexpectedly (power problem),how can it recovers?

My bookmarks are lost after turning off the computer unexpectedly (power problem),how can it recovers？ Thanks a lot !!!!
我的书签在电脑突然被断电之后全部丢失了，我该怎么办呢？？谢谢啦！！~~~~

This can also be a problem with the file places.sqlite that stores the bookmarks and the history.
* http://kb.mozillazine.org/Locked_or_damaged_places.sqlite
* http://kb.mozillazine.org/Lost_bookmarks

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Very simular, although your cycle count is higher.
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Perhaps corruption of the Energy Saver settings...
Reset the PRAM cannot hurt.
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Phone with busted screen turns on right after turn...

Hello everyone,
Thought i'd register to lay out a problem i have with my N95 phone. First of all, great phone, ive been using it for years and it still competes with everything out there for me. It did break down occasionally, but nothing i couldn't fix by cleaning the contacts or whatever, i always found a way to get it going again.
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I started looking for cases similar to mine and i came across tons of topics, they all pointed in the same general direction, format the phone using either the 3 * green button method or calling to #7370# and so on. Would be fine solutions if my screen worked, but since it didn't i was in for a blast. I tried the 3 button method and it seemed to be doing something, but since i couldn't see anything it was a little tricky to tell, but anyway i just assumed it did something. I left for a few days (i'm not one for half measures) hooked to the power and just let it format, or i thought so because i couldn't actually see anything happening because the screen wouldn't come on. After seeing nothing change i just turned it off. But it wouldn't turn off, because immediately after it gave a bleep and turned back on again. When i try to shut it down it happens again, comes back on. Only way to kill the power is to take out the battery, but when i pop the battery back in the same thing happens, the phone turning on after turning it off.
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Moderator's Note: We have removed mention of unofficial parts which may void warranty of other users.

Hi miintz,
You phone will need repair. Please contact a Nokia Care point in your country so they can take a look at your phone and help. You can find Care point locations globally from www.nokia.com/repair or your local Nokia website -> Support.
Also note that as your warranty may be void, a charge may be in place to get it fixed. Let us know how you get on.
Regards,
haZey
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If it also solves your problem, clicking ACCEPT AS SOLUTION below it will benefit other users!

I have been able to wake my macmini by hitting the space bar - but since installing 10.7.4 using the 1.4Gb combo this wake method no longer works. Now the macmini shuts down, and I have to switch mains power off and on again before powering up the macmini

Since purchase of my macmini (2011 model) I have been able to wake it from sleep by hitting the (wired) keyboard space bar.
However, I recently updated the OS to 10.7.4 using the combo (1.4Gb) update, since when I cannot wake the macmini in that way.
Now, after putting the macmini to sleep, pressing the spacebar causes it to shut down.
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I am by no means an expert, and have not been fiddling with settings, so I am in need of advice on what could need resetting to allow me to return to the previous simple 'wake up' approach!
Thanks.

Reset the SMC > Intel-based Macs: Resetting the System Management Controller (SMC)
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Wait fifteen seconds.
4. Attach the computer's power cord.
5. Wait five seconds, then press the power button to turn on the computer.
Followed by resetting the PRAM > Resetting your Mac's PRAM and NVRAM
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.
Then if those do not fix the problem, you may need to reset your Energy Saver and Keyboard Preferences by readjusting them.

Mains power cut to house - iMac now DEAD

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Here is what Apple says to do with an iMac that won't start, it's from the owner's manual.
If your iMac won’t turn on or start up Â Make sure the power cord is plugged into your iMac and a functioning power outlet.
Â Restart your computer while holding down the Command (x) and R keys, until the computer restarts. When the Mac OS X Utilities pane appears, select an option to repair your disk, restore your software, or reinstall Mac OS X and Apple applications. For more information, see “Repairing, Restoring, or Reinstalling Mac OS X Software” on page 44.
42 Chapter 4 Problem, Meet Solution
Â Press the power button (®) and immediately hold down the Command (x), Option, P, and R keys until you hear the startup sound a second time. This resets the parameter RAM (PRAM).
Â If you recently installed memory, and your iMac sounds tones every five seconds, make sure that the memory is correctly installed and that it is compatible with your iMac. Check whether removing the memory you installed allows your iMac to start up (see page 38).
Â Unplug the power cord and wait at least 30 seconds. Plug the power cord in again and press the power button (®) to start up your iMac.
Â If you still can’t start up your iMac, see “Learning More, Service, and Support” on page 54 for information about contacting Apple for service.

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OK - my husband may have got to the bottom of this one but I would very much appreciate an expert opinion.
Our electricity supply is solar energy entirely. When there is not much sun the batteries run down and the power output reduces. What we think is happening is that the supply of energy sometimes does not meet the needs of the computer. It then switches to run on the pc battery, until that of course too runs down and has to shutdown the machine. This would be consistent with the inability to switch it back on to recharge the battery. The battery has run down twice more since the original post (with mains power connected) and on both occasions it was late evening after a poor, cloudy day.
Once our solar system is back up to potential we can switch the pc back on and the battery recharges normally.
If fact, if we are right, this would indicate to me a healthy machine working as it should do. I imagine that switching to battery when the power is low is a safety device to prevent system damage.
Again, if we are right, would a UPS help prolong the time we could use the system on cloudy days?
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Comments please.

No firewire after turning of mains power - SMU reset needed to fix

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