Power source only gives 3V

Hi, first of all I want to apologize for my English.
I have bought a computer about three months ago and it has given me one headache after another.
motherboard: Asus A7V8X-X
processor: Athlon XP 2400+
512 Mb RAM
video card Nvidia FX-5500

It has a 400 W power source. I ran Asus PC Probe and noticed that it was not giving 3.3 V but only about 3.0. And it was giving 12.5, not 12.
Today the computer would not boot up, so I called a technician and he saw that there was a problem with the 3.3 cable. He lent me another power source and it is working, but PC Probe is still showing 3.0 V
a. Is this a problem?
b. Can it be a motherboard problem? Could the motherboard cause the source to fail?
Thanks.
clauAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

stockhesCommented:
On my nforce2 board (EPOX) all monitors reports the 3,3 volt as 2.7 volts I did a lot of digging into this and found out that it was my Vdimm(ram) that was reported as 3,3 volts.

If you have access to a voltmeter simply measure the voltage between and orange wire(on top of my head) and a black wire

ATX spec says all tolerances is +/- 5% except 12volt where +/-10%

So 12.5 is ok but 3.0 is not

HAve you tried inspecting those values in the BIOS ?

And yes theoretically a motherboard in case of shorting or malfunctioning can "cause the source to fail"


0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
ridCommented:
If it runs OK, it may be unimportant. A too low voltage doesn't sound dangerous to me. Besides, these on-board voltage probes, anyone knows how accurate they are? If you are concerned about this, make sure you check the reading with a proper meter.
/RID
0
clauAuthor Commented:
Some more info:
Today I tried the new power supply in another computer and it gives the 3.3V OK.
I am reading the info from the hardware monitor in the BIOS setup.
The new computer does have problems: it freezes, I had to use a USB keyboard because PS2 ones stop responding, I had to install Windows 98 because I had trouble with the video card drivers in Win XP, etc.
Tomorrow I will try another one
0
clauAuthor Commented:
Well, I did many tests and:
a) tried 2 DIMMs 256 Mb each DDR333 instead of my DDR400 PC3200 512 Mb DIMM - same result
b) tried a GeForce 440 64Mb RAM and the power supply gave 3.1V
c) tried a 450 W power supply and it gave 3.3V

So, my conclusion is that there is something in the motherboard that is eating too much power.

Maybe it is a faulty mobo? Or is it a feature?
Is there a way to verify this?
Stockhes, how can I find out if I have the same RAM problem than you?
0
rindiCommented:
clau,

No comment has been added to this question in more than 21 days, so it is now classified as abandoned..
I will leave the following recommendation for this question in the Cleanup topic area:
Accept: stockhes

Any objections should be posted here in the next 4 days. After that time, the question will be closed.


Rindi
EE Cleanup Volunteer
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Desktops

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.