Newly Built Computer Won't Stay On

"OSbandito" wrote in message
...
*snip*
"My opinion, which is affected by low intellect and bad upbringing"

-------------------------------
That's hysterical...I love your sense of humor!

Russell
http://tastycomputers.com

On 15 Dec 2006 10:09:18 -0800, wrote:


1) PSU itself isn't staying within accepted voltage ranges
and shuts off. Might be defective, might be powering
defective parts, or a general system build error has shorted
something (doubtful since it stays on 4 seconds).

It would be ironic if the PSU were the problem. In the past computers
I've built I always purchased the cheapest case/PSU combo I could find
and had no problems. This time I bought in to the advice to get a good
PSU, and here I am with a no start! Sigh...

Systems use more power now, you'd be even more likely to
have a psu problem, or at least early death, with the
typical cheapest came-with-case unit.

Given a low(er) powered integrated system, as you may have
with the integrated video (and sound, lan to lesser extent),
many of the branded PSU that come with newer-generation
cases might do fine.

wrote in message
ups.com...

Robert Heiling wrote:
Jack Bruss wrote:

I just built a new computer, and when I turn it on, it turns off in
about 4
seconds. I hear a longish beep, and all 4 fans in the system are
turning
before the whole thing shuts down. There is no time for anything to
show up
on the monitor. The system is as follows:

CASE - COOMAS|CAC-T05-UB BLK/BL RT
PSU - SUNBEAM|SUNNU450-US-BK 450W RT
MB - ASUS M2N-MX GF6100 AM2
CPU - AMD|A64 X2 3800+ AM2 2x512K R
MEM - 1G|OCZ DII800 OCZ2P800LP1G R
HD - 120G|WD 7K 8M SATA2 WD1200JS

The Power supply has this temp monitor fan controller thing, and it
shows a
temp of about 25 C, before the computer shuts down. I've tried
starting
with the knob at high, low, and auto, with the same results, that is
shut
down in about 4 seconds.

I tried to boot before I installed the drives, and got the same
results.

Since nobody else has mentioned it, I'll toss this out. Double-check your
wiring
job in regard to the power-on and reset buttons and motherboard pins.
Your magic
4 second delay is exactly the effect you would get if power-off were
being held
down.

Bob

I can't check this until tonight, but do you mean the LED connections?
I know on some of them, it was not clear which way they should go on.

Jack

The LED connections wouldn't have any affect on whether the comp stayed on
or not. If the connectors were placed backword the LEDs simply would not
light. But if you are skeptical if you've got them right then it certainly
would be a good thing to recheck the manual.. I lean towards PS problems
myself..

--
Jan Alter

or

Robert Heiling wrote:

Since nobody else has mentioned it, I'll toss this out. Double-check your wiring job in regard to the power-on and reset buttons and motherboard pins. Your magic 4 second delay is exactly the effect you would get if power-off were being held down.



Bob Good answer--hitting the basics first. But you should warn him:
if he got his wires crossed, he will have to remove his shorts.

OSbandito wrote:

Robert Heiling wrote:

Since nobody else has mentioned it, I'll toss this out. Double-check your wiring job in regard to the power-on and reset buttons and motherboard pins. Your magic 4 second delay is exactly the effect you would get if power-off were being held down.


Bob Good answer--hitting the basics first. But you should warn him:
if he got his wires crossed, he will have to remove his shorts.

In pubic?

OSbandito wrote:
Robert Heiling wrote:

Since nobody else has mentioned it, I'll toss this out. Double-check your wiring job in regard to the power-on and reset buttons and motherboard pins. Your magic 4 second delay is exactly the effect you would get if power-off were being held down.



Bob Good answer--hitting the basics first. But you should warn him:
if he got his wires crossed, he will have to remove his shorts.

Well, I've tried reversing the power on wires, removing the reset
wires, removing and replacing the heat sink/fan, and moving the memory
to a different slot, and there has been no change. I don't have spare
mbs, memory, or PSUs lying around, so I guess I'll go buy a power
supply first, and try that.

Thanks for the advice, and keep it coming.

Jack

you covered the gambit of 'free' things to do...
PSUs are the most important hardware in the rig, only recently(18 months or
so) this has been so much more a truism.

wrote in message
ups.com...

OSbandito wrote:
Robert Heiling wrote:

Since nobody else has mentioned it, I'll toss this out. Double-check
your wiring job in regard to the power-on and reset buttons and
motherboard pins. Your magic 4 second delay is exactly the effect you
would get if power-off were being held down.



Bob Good answer--hitting the basics first. But you should warn him:
if he got his wires crossed, he will have to remove his shorts.

Well, I've tried reversing the power on wires, removing the reset
wires, removing and replacing the heat sink/fan, and moving the memory
to a different slot, and there has been no change. I don't have spare
mbs, memory, or PSUs lying around, so I guess I'll go buy a power
supply first, and try that.

Thanks for the advice, and keep it coming.

Jack

wrote:

OSbandito wrote:
Robert Heiling wrote:

Since nobody else has mentioned it, I'll toss this out. Double-check your wiring job in regard to the power-on and reset buttons and motherboard pins. Your magic 4 second delay is exactly the effect you would get if power-off were being held down.



Bob Good answer--hitting the basics first. But you should warn him:
if he got his wires crossed, he will have to remove his shorts.

Well, I've tried reversing the power on wires, removing the reset
wires,

I wouldn't be comfortable with what you describe. Why don't you simply remove
all connections to those 10 sets of pins -LED, Reset, Speaker, Power - All of
them! Then briefly short the Power pins. If the behavior is still the same, then
you've ruled those out.

removing and replacing the heat sink/fan, and moving the memory
to a different slot, and there has been no change. I don't have spare
mbs, memory, or PSUs lying around, so I guess I'll go buy a power
supply first, and try that.

Thanks for the advice, and keep it coming.

But if it comes on and stays on, you'll know where to look for one problem.

Bob

On Fri, 15 Dec 2006 21:44:45 GMT, "Jan Alter"
wrote:


The LED connections wouldn't have any affect on whether the comp stayed on
or not. If the connectors were placed backword the LEDs simply would not
light. But if you are skeptical if you've got them right then it certainly
would be a good thing to recheck the manual.. I lean towards PS problems
myself..

It is true, LED connectors being reversed polarity wouldn't
in itself cause this, but wrong connector block wiring,
particularly to one of the OEM or (more elaborate new cases
with several function circuit boards in front) other cases
could conceivably route LED or other logical connections
where they shouldn't be. Thus, the safest bet is to unplug
all such wiring and turn system on by momentarily shorting
the two power-on pins together with a metallic object.

Robert Heiling wrote:
wrote:

OSbandito wrote:
Robert Heiling wrote:

Since nobody else has mentioned it, I'll toss this out. Double-check your wiring job in regard to the power-on and reset buttons and motherboard pins. Your magic 4 second delay is exactly the effect you would get if power-off were being held down.



Bob Good answer--hitting the basics first. But you should warn him:
if he got his wires crossed, he will have to remove his shorts.

Well, I've tried reversing the power on wires, removing the reset
wires,

I wouldn't be comfortable with what you describe. Why don't you simply remove
all connections to those 10 sets of pins -LED, Reset, Speaker, Power - All of
them! Then briefly short the Power pins. If the behavior is still the same, then
you've ruled those out.

removing and replacing the heat sink/fan, and moving the memory
to a different slot, and there has been no change. I don't have spare
mbs, memory, or PSUs lying around, so I guess I'll go buy a power
supply first, and try that.

Thanks for the advice, and keep it coming.

But if it comes on and stays on, you'll know where to look for one problem.

Bob

I just located an older 20 pin PSU in my basement, but my mb needs a 24
pin. Is there any way to use this old PSU, just to see if it fixes the
problem before I buy a new one?