"kony" <> wrote in message
news:...
> On Wed, 4 Jul 2007 19:29:08 -0500, "mxh" <>
> wrote:
>
>>Problem:
>>
>> System will not start. Pushing power button results in momentary (about 1
>>sec.) movement in case fans. D-bracket flashes all 4 LEDs and goes out.
>>Front LED's (power & HD) flash 1sec, then off, then power LED flashes on &
>>off at 2 second intervals (on 2sec, off 2 sec). Unplug power supply. Turn
>>switch off. LED goes on & off 2 or 3 more times. If I don't unplug the PS,
>>the power LED will continue flashing as described. At this posting, it has
>>been doing so for about an hour. Plug PS back in, press power, begins same
>>cycle as described.
>>
>>-------------------------------------
>>Events preceding problem:
>>
>>Pioneer AO10 DVD burner went bad (ceased reading discs). Replaced with
>>Lite
>>on DVD/CD player (had on hand).
>>
>>Immediatley after replacing the above drive, the problem began. I
>>unplugged
>>the PS and checked connections for power supply at mother board (both
>>molex
>>plugs). Plugged PS back in. I believe I had to unplug the PS 2 or 3 times
>>and finally the system started.
>
> Since you'd just been in the system I would recheck all
> cables, cards, memory, etc - just in case something became
> loose/etc, though below you do describe some of this, maybe
> everything.
>
Yeah, I didn't mention that in the 'diagnostic efforts' list, but that is
the fiorst thing I checked.
>
>>
>>System went into hibernation that night. This morning, the system powered
>>back up out of hibernation fine. This afternoon, I shut the system down to
>>blow dust out of the CPU heat sink. The problem began again and has not
>>started.
>>
>>-------------------------------------
>>
>>Diagnostic efforts:
>>
>>Unplugged system, let sit and plugged back in.
>>Removed and reset RAM chips
>>Removed & reseated CPU.
>>Removed & reseated PS molex connectors (both power connectors)
>>Unplugged DVD drive (data & power)
>>Unplugged a few of the SATA drives.
>>Removed all USB devices.
>>
>>I haven't tried a different PS because I don't have one on hand and would
>>like other opinions before I start spending money.
>>
>>MS-7125
>>4400x2
>>4 Seagate SATA
>>xfi plat
>>2 GB Corsair DDR
>>ATI 1800XL
>>Liteon DVD/CD Player
>>Antec TruePower 2.0 550w
>>
>
>
> Random guess is that your PSU has failed capacitors in it.
> How old is it? It's just funny/odd that this happened to
> coincide with putting the new drive in. Above when you
> wrote "unplugged ... drive" I assume that to mean you had
> left the drive unplugged when you tried to start the system
> again, correct?
Correct. Thanks for your input. As I posted in my other response to you, it
is indeed the PS. I picked up a tester and another PSU (Antec TruePower Trio
550w) at compusa (whom I hate doing business with, but diodn't have time to
wait for delivery). All appears well now. It is indeed a coincidence that it
went out after changing the burner, but after 30 years in the service
industry, I've seen many such coincidences, although they are still hard to
accept. Again, thanks for your help.
mxh
>
> Try clearing CMOS (with AC power disconnected), by jumper or
> pull the battery for a few minutes. If that doesn't help
> you might strip system down to bare essentials (CPU,
> heatsink/fan, 1 memory module, video) and retry it just
> trying to get it to post then adding things back, but this
> could lead to a false conclusion as well, because as you add
> things back at some point it could be too much of a load for
> the PSU (if it were failing gradually, it may be more stable
> with a lower load on it) making it seem like adding part X
> made the difference when it could instead be that it was the
> amount of power part X used. I may be on a tangent too much
> here, talking about the PSU as there might be a board
> problem like ESD damage but I would suspect PSU.
>
> You could unplug it from AC for several minutes then open,
> inspect it... the caps would be near the exiting wiring
> harness, usually.
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