Burned out psu.It burns out when the computer is off .

March 9, 2012 at 14:02:21
Specs: xp media center, 2gigs p4 ht
my psu in my dell 8400 keeps burning out when the computer is off.I replaced the 350watt with a 400watt and used it for 4hrs and shut it down an the next day it wont start.What could it be?

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March 9, 2012 at 14:36:40
You really haven't told us anything. Power supplies should NOT be judged by wattage alone. There are numerous specs that need to be considered - amperage ratings, active or passive PFC, efficiency rating, etc. And it should come from a reliable brand name manufacturer. What brand have youy been buying & how much have you been paying?

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March 9, 2012 at 14:50:38
The first one was the factory dell psu.It burned out with the computer off.But it had a burnt smell before it went out,to much dust and old.The new one is a Hercules 400w.So this is the the replacement for the replacement. same brand The computer runs fine with no codes or error messages.When you shut it down it will not restart.The psu is just plain dead.With no burnt smell.All the pins on the motherbored are good the capastors all look good.The psu is hooked up right so i just dont know what gos on with this thing.

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March 9, 2012 at 15:30:28
1. PSUs do NOT burn out while the system is shutdown

2. Hercules PSUs are absolute garbage/cheap junk. You got exactly what you paid for:


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March 9, 2012 at 16:26:46
it says:
"Warranty: 90 Days"
but for 12.99, its likely not worth sending it back. Wonder if they realize that?


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March 9, 2012 at 17:27:20
I have a year,and free shipping.This thing is burning up when it is off.I don`t care what the guy says up top.I have another dell psu,but i will not try that one till i find out why this one is burning up.There is always power to the unit even when it is off.It sure is not burning when i`m on the Computer.

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March 9, 2012 at 19:17:43
Have the power to the outlet tested either by a professional or using one of those plug in testers that will show you if the polarity is correct and the ground is correct and not faulted. If it is not correct, have a professional investigate and repair it. If it is fine then try a better quality power supply by a quality company (at least $40.) with a high efficiency rating and a 3 year warranty.

You have to be a little bit crazy to keep you from going insane.

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March 9, 2012 at 19:20:29
Yeah it's not burning out when it's off; it must be happening when you shut it off or when you turn it back on. Is it connected through a UPS or surge protector?

If the problem is not at the AC input then it must be inside the computer case. Something there must be trying to pull too much current from the PSU. Maybe a short on the motherboard.

If they're covered under warranty and it's practical to send the PSU's back, I'd go ahead and do that, although you may want to keep one and open it up and see if the PSU internal fuse is blown.

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March 10, 2012 at 06:17:09
I don't know what happened to the Dell PSU but the Hercules is cheap junk & is NOT capable of handling the load of a modern system. Invest in a decent brand name PSU like this Corsair 430W for $25 after $20 rebate:

CORSAIR Builder Series CX430 V2 (CMPSU-430CXV2) 430W ATX12V v2.3 80 PLUS Certified Active PFC Power Supply

And I suggest you do some reading. The PSU is one of the most poorly understood components in a system:

Don't Be Surprised When Your Cheap PSU Blows Up

Picking The Right Power Supply: What You Should Know

Who's Who In Power Supplies, 2011: Brands Vs. Manufacturers

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