ASUS K8VX-SE problem

Hi

I recently bought a new computer with ATHLON 64 3000+ 2GHz, 512 RAM, ASUS K8VX-SE, 80Gb IDE WD.

Sometimes when I start the computer, the red (hdd) and green (power) lights on the case stays up (or green flashes and red is up), the coller on the processor starts....... and that's it...... the hdd doesn't start, nothing else happens.

If I power off the computer keeping pushed the power button for few seconds, and after I power up again everything goes fine, hdd starts (i mean i can hear the noise made by hdd normally at start) and all works just fine.


Which could be the problem?

Thaks a lot,
Chris

acristianx1Asked:
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rindiCommented:
Could be that something isn't properly seated, the CMOS battery could be bad, the powersupply could be too lowpowered or the mainboard might be bad. Look for capacitors that might be cracked, bulging or showing signs of leaking. In the link below is a calculator that should help you find the correct PSU, but often you should also get a good brand. Noname powersupplies, even if they have enough wattage, might be worse than a good PSU with less wattage.

http://www.jscustompcs.com/power_supply/
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MarkCommented:
What PSU do you have in there. The Athlon 64 needs at least 18A on the 12 volt rail to start up. Check the label on the PSU to confirm that requirement.
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PCBONEZCommented:
Both the above are possible.

I would think with a loose connector it wouldn't -always- start properly on a restart.

It sounds to me like a faulty or underpowered power supply. (Or a voltage regulation circuit on the mainboard.)

When you re-boot it's effectively cycling the power supply on/off and that clears whatever condition is causing the problem long enough to start the system.

The power supply is more likely the problem (happens more often) so that's what you should look at first.
~ Many PC cases come from the factory with cheap or underpowered power supplies and if they used the one that came with the case to build the system. ~~~~
.
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acristianx1Author Commented:
My case is MIDDLETOWER CASE 400W P4 ANS 7610-RJA, 404U, C TYPE, BLACK FAN SIDE PANEL, ATX, so the power supply is 400W. I think that if the power supply unit was bad it would fail during the normal operation of the computer..... this never happens. The computer works just fine. If the power wasn't 18A on the 12V rail that would mean the Athlon 64 processor would never start. Is that right?
But the computer starts fine...... now on the third try. :((

Anyway i'll check the source and come back with details.

Thanks.

Chris
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pcchecksCommented:
could be one of the other parts. Unplug all unnecessaries(drives, modem,network) and try to boot up a few times(about 5). If successful then plug back in one at a time rebooting the same way until you find the culprit. If unsuccessful, reseat the memory or move to another slot. You may want to upgrade the bios.
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PCBONEZCommented:
"I think that if the power supply unit was bad it would fail during the normal operation of the computer"
~ Wrong ~
By that thinking....
With the exception of the actual O.N. - O.F.F. switch name a part that, if bad, would not fail during operation.

There are many different parts inside a power supply and many many different failure modes.
Many of those are due to capactor problems which aren't necessarily an 'instant' or 'constant' problem due to the nature of capactors charge/discharge operation and them having a charge and a discharge time constant.
There are LOTS of caps in power supplies and a bad circuit with a cap can allow the voltage to creep to some value over X amount of time rather than instantly and it will 'stick' there until the cap discharges. (Like when you cycle the power supply when you "power up again".) When you put the power supply under load it is in a different condition (aka current flow) so that voltage may not creep.
.
The first 3 posts came from well established Experts and suggested you look at the PSU.
Maybe there is something to it. Ya think?
.
pcchecks problem isolation method is a good one.
.
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phototropicCommented:
If none of the above works to solve your problem (and it would be surprising if it didn't!), it is not unknown for the actual power switch on the case to malfunction. You mention having to keep the power button pushed in for a few seconds, and then power on again, so it could be worth checking.
Disconnect mains power, then open the case and find the "pwr swt" connector. Here it is located at the bottom left:

http://www.asus.com/products4.aspx?modelmenu=2&model=790&l1=3&l2=14&l3=67

If you remove the connector, you should be able to reconnect to mains power and then turn on the pc by shorting out the two terminals with a small screwdriver. If you can start the pc consistently like this with no problem, the next step would be to look at the case switch. Troubleshooting/replacing case switches is notoriously problematic, and can involve pieces of plastic and superglue!!! If your pc is new, I would think a faulty case switch would be just grounds to return it and demand a replacement.
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PCBONEZCommented:
phototropic,
Good point but if you read the original post he gets a system responce from the switch.
"" the coller (aka cooler) on the processor starts ""
It just won't come all the way up.
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phototropicCommented:
PCBONEZ,
My reading of the original post is that he is reporting an intermittent fault: "Sometimes when I start the computer..." This would be consistent with a case switch problem, although it is surprising that the issue has not been resolved by the initial advice. In my experience, case power switch failures are rare, but difficult to address when they do occur.
If the machine powers up consistently when the power terminals on the mobo are shorted, it seems the most likely explanation.
Acristianx1,
Has any of this helped to resolve your problem?
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PCBONEZCommented:
phototropic
Yes I know it occationally happens.
That's why I mentioned the switch in the post immediately before yours.
.
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rindiCommented:
The powersupply needs to supply a lot of power during startup, it has to get the drives running etc. Once all that is running less power is used, or the drain is more gradual and not a sudden surge which you get when powering on. This would result in problems when booting, but once the system is running things tend to be OK.
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