Multiple Problems

I would say the power supply is the wrong voltage or is otherwise connected incorrectly to the MB and components.

Not knowing anything about your new power supply or what kind of hard, floppy and CD drives you have in the system, my first suspicion would be the power supply. You have more extras than the typical PC. Is it adequate to handle your needs?

Hello Bradley:

Sounds like a real predicament I wouldn't want to wish on anyone. When or prior to the power supply failure, was there any known voltage spikes or power surges? Sometimes when a PS goes bad, it will take certain components with it. From what you're describing, a crash, many times involves an overload of voltage. You know that PC's are delicate electronics. But before ruling out the sound card completely, go to your Device Manager and temporarily disable it then run your machine for awhile. If you have a spare, try replacing it to see if the computer is still freezing up.. your 2nd video card is likely fried too. But unplug the fan, then re-seat it. Do this for your card as well. Run PC Health or system tools, located in your Start Menu under Accessories. Better yet, if you don't have a copy, pick up Norton System Works and run System Doctor.

Be sure your PS is AT LEAST 320W! It MAY not be delivering enough power to the system.

My opinion is that when your PS went, crashing your system, it's very likely that Windows became corrupt. Start up in SafeMode (F8 after POST and before the GUI pops up and run a System Restore back to a date prior to replacing your PS. If this doesn't eliminate the loginUI errors, run the Windows installation routine again. Be prepared to do a clean install, so back up your errors.

Good luck and hope this helps! I'd be interested in knowing the resolution.

Regards,
Jesse

I hate it when that happens! One thing you have said that stands out to me is the "onboard sound card" fails to work now. When power supplies fail weird things happen to the voltages and BIOS settings get whacked as a result. It sounds like the BIOSsettings may have been corrupted. If everything "looks" right try pulling the CMOS battery and remove the jumper to set everything to default. Do not try to use the software setting "return to default" in the BIOS. I usually take blown power supplies from the perspective of rebuild. I.E. checking everything as if I were building it for the first time. DO NOT rule out the new power supply! As pointed out it may be too small. Another probability, because it says 350 watts does not mean that is what it is putting out. Also just because it is new does not mean it is good. I can tell you some horror stories. The loginUI.exe is the program for swapping the XP log in screen. You my have a corrupt login profile that can't load or the actual .exe may be corrupt. I would start by making a new user, then login under the new name and see if the error reappears. As far as the TNT2 fan can you try the fan on another power header? The fastest way to test is get good known power to the fan and see ifit works. Unfortunately power supply failures can be ugly/dirty, it takes time and patients and a little luck to work through. The luck being no component was physically damaged. Time and a good eye will determine that. Good Luck!

I agree that the first step is to make sure that the new power supply is good, and powerful enough.

I would go so far as to step up to 500 Watts.

Now, what concerns me is the PC Health warnings.

I suspect that when your old power supply failed, that it damaged the voltage regulators on your motherboard.

You should be able to view the voltage levels in BIOS settings.

If not, you need to have an Electronics Tech measure the voltage outputs of the power supply, and the on-board regulators.

Other options, unplug the sound card, and ALL network cards and modems.
Does the PC function better?

If not, then I trully suspect the voltage regulators.
These are NOT user replaceable parts. It takes special soldering tools and skills to replace any semi-conductor on the mother board.

If it looks like the problem is with the motherboard, it may be cheaper to get a new motherboard than to repair the one you have.

Chas

From experience if you built the PC yourself then there is a possibility that devices on the PC are not compatible. If so check your warrantee and return components while it matters. Save yourself all the agro and buy a branded PC with warrantee.

Bradley O, I'll bet you didnt know that there were 2 ATX spec. power supplies. The original had too much noise and had to be modified. I would buy a new power supply. I would also make sure that you have enough wattage to cover all of your components. Sometimes the power rating that systems come with are meant for systems without any extra peripherals. I would buy a larger power supply than what you originally had.

If you have access to a post card, you could determine if your voltages are in line. Power supplies that are used in PC's are switching, and poor quality ones, are noisy.

I hope this helps out. Poor voltage problems can cause problems in all sorts of things, like the CPU, the Hard drive, sound card, software, etc. The onlything you would have to go on without proper troubleshooting is software errors. Thats like shooting turkeys in the dark!

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