Chris Wright wrote:
Bob Chiodini wrote:
On Tue, 2006-03-14 at 10:26 -0500, Reuben D. Budiardja wrote:
On Tuesday 14 March 2006 08:55, Bob Chiodini wrote:
On Tue, 2006-03-14 at 08:21 -0500, Reuben D. Budiardja wrote:
<snip>
Reuben,
Have you checked the power supply?
I have not checked the power supply for the system. Any
recommendation on how to do so ?
Have all of your failures been in the same machine?
Yes, all in the same machine, that's why I suspect there's something
else physically wrong.
Thank you.
RDB
--
Reuben D. Budiardja
Dept. Physics and Astronomy
University of Tennessee, Knoxville, TN
Reuben,
Open up the case and find an unused drive power connector. Measure the
voltage between the yellow and black, should be ~12VDC. The voltage
between the red and black should be ~5VDC. I'm not sure what the
tolerances are for your drives, maybe it's on their website. As a rule
of thumb, I'd not let the 12V get below 11.9V or above 12.1V (about
10%). The 5V should be above 4.8V and below 5.1V. These are guidelines.
The last time I opened a PC power supply the 12 and 5 volt supplies were
not independently adjustable.
Your BIOS may also tell you these voltages, along with various
temperatures. lm_sensors might work as well.
Bob...
One thing to try when testing the power supply as above is to make sure
you 'load' the system.
When the system is idle (or close to idling), the 12V for example, might
be 11.99V. But when you start spinning up multiple hard drives, this
puts a load on the power supply.
If there is fault with the power supply, it will cause the voltages to
drop.
'Most' PC PSU's are meant to be constant voltage type, ie. they try to
maintain their voltage outputs as close to spec as possible
(+5v,-5v,+12v,-12v, 3v etc etc etc). If you took most PC PSU's out of
the case and measured their outputs with nothing connected, you would
read near exact values.
It is only when you place them under load that the outputs will vary or
indicate a fault.
So while measuring, try to run some sort of 'stress' test on select
items of kit / various items of kit.
Also worth pointing out, is that a lot of people these days are
inserting extra fans inside their machines, and these sometimes have
thermostatic controllers on them to switch them on at a certain temp.
Some fans are electrically noisy, and of course, that noise will also
only be present when the fan is running. Likewise, they will only
'load' the system when they too are running.
So in summary, make sure you are running as much of a stress test as you
can (without making it a destructive stress test).
Regards
Chris
This may be a helpful link.
Do the Math to Get Your PC All the Power It Needs
<http://www.pcworld.com/howto/article/0,aid,119585,pg,2,00.asp>
I came across it when I was having problems burning DVD's. Everything
would go great until the very end or when ejecting the DVD. I would
have system freezes. Changed the PS and all is well.
--
Robin Laing
