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  #1 (permalink)  
Old 21st July, 2004, 09:32 PM
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Intermittent boot power failures with 8KDA3J

Hello,

My newly built system is suffering from intermittent power failures during boot. (System specs to follow). Often the system powers up, the fans spin up, and the boot process begins - but within a few seconds the system goes completely dead. If I keep attempting to reboot, the system eventually manages to boot successfully and seems entirely stable once it has managed to boot into Windows.

The symptoms are exactly as described in the following thread:
8KDA3+ new build saga = PSU

The failure happens about 75% of the time (roughly 1 in 4 times it boots successfully). The motherboard error display runs through C1 - C3 - 25 - 26 - FF - and then the system goes dead. It always fails at the same point during the boot cycle. During a successful boot, it runs through the same sequence, but then continues on past that point.

I've tried two different power supplies (both 350W, different brands), two different RAM modules, several BIOS versions, reseating all cards & power connectors, etc. I also tried disconnecting some of the system components (DVD-ROM, cooling system) in case the problem was excessive load on the PSU. The problem persisted through all of this. I am fairly sure it isn't heat-related; the system seems to be running at comfortable temperatures and seems stable if it can get through the initial boot.

System specs: 8KDA3J, 512MB SimpleTech PC3500, Athlon 64 3200+, Maxtor 250GB hard drive, Samsung DVD-ROM, Kingwin Arctic Liquid cooling, SB Audigy 2 ZS, GeForce 4 MX420 (standing in till new graphics card arrives ), Antec 350W PSU.

Epox support (and the thread linked earlier) suggest that the problem is with the power supply (even though the problem appeared with both power supplies that I tried). Before I spend more money on yet another power supply, I'd greatly appreciate a second opinion from the folks on this forum and a suggestion for a good PSU.

Thanks!
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Old 21st July, 2004, 09:36 PM
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Which makes and models of PSU have you tried?
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Old 21st July, 2004, 09:46 PM
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Antec SmartPower SL350, plus the generic 350W PSU that shipped with my case (Aspire X-Turbo). Both gave the exact same behavior.
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Old 21st July, 2004, 10:08 PM
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The Antec 350W Smart Power only has 16 amps max load on the 12 volt rail.
This is probably at least part of the problem.
I will be putting in a Tagan 480 watt in my system (28 amps on the 12 volt line) which is very powerful and quiet
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Old 21st July, 2004, 10:47 PM
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The sequence C1 - C3 - 25 - 26 - FF is a bit odd. It seems to indicate that something has interrupted the POST process and caused a system reset. When you do get it up and into windows, have you run any stress testing, like CPU burn or similar?

When the system goes dead, is it like someone's pulled the plug, or are there still signs of life?
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Old 21st July, 2004, 11:01 PM
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Is this VGA card definatley of a pure 1.5v construction - are you able to try with a different VGA card ?

It may be that this is the hurdle that is to be overcome - see if you can borrow a FX type card or a Radeon 9500 or greater.
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Old 21st July, 2004, 11:31 PM
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Thanks for the responses.

I have run Prime95 for a while and as I mentioned the system seems stable once it makes it through the boot process. When the boot fails, the system goes completely dead. The lights go out, the fans spin down, etc, just as if I'd pulled the power cord out.

I haven't tried a different graphics card, but I'll try swapping in one from my other machine tonight. I'll let you know if that seems to fix the problem.
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