Re: a7v600-x stuck in reboot loop?

I had a similar problem so I send ASUS support a e-mail(below):

Product Information]
*Product Type : Motherboard
*Product Model : A7V600-X
*Product S/N : 51MM580924
Place of Purchase :
*Date of Purchase : 2005/5/13

[Motherboard Specification]
*Motherboard Revision : A7V600-X-UAY0Z
*Motherboard BIOS Revision : 1009

[VGA Card Specification]
*VGA Card Vendor : BFG Technology
*VGA Card Model : GeForce 6600GT(AGP)
*VGA Card Chipset : Nvidia
*VGA Card Driver : 77.72

[CPU Specification]
*CPU Vendor : AMD
*CPU Type : Socket A
*CPU Speed : 3000+

[Memory Specification]
*Memory Vendor : Kingston
*Memory Model : KVR400X64C3A
*Memory Capacity : 512 MB

[HDD Specification]
HDD Vendor : Quantum
HDD Model : Fireball Plus AS
HDD Capacity : 20 GB

[Add-on Card Specification]
Add-on Card Vendor : Turtle Beach
Add-on Card Type : Audio
Add-on Card Model : Santa Cruz

*Operating System : Win98SE

[Problem Description]
Computer will not boot every so often. Power comes on(fans and LED), some
hard drive activity then
nothing(no video). So I hold the power button in till computer shuts off
then restart it. I have to do this
once or twice sometimes more before the video initializes. When the video
comes on it opens to the
BIOS screen stating the CPU speed was set wrong and to check settings. The
setting is correct
on the screen so I just save the settings and exit. When I first started
having this trouble I would get a
beep code(1 Long 3 Short). I read on different websites that this was a
video problem, so I bought a
new video card(BFG GeForce 6600 GT) to replace a Leadtek GeForce 2 Pro. The
problem stopped
for the next day or so(just a coincidence I believe). I also upgraded my
power supply from an Enermax
350 watts to Enermax 470 watts because I thought this could be a problem
especially with the new
video card(6600 GT). I have checked the memory(DDR 400/512MB) with
MemTest86(7 passes)
with no errors. This problem only happens when starting the computer after
it is off for several
hours(usually over night). Everything worked fine on this computer when I
first put it together(May
2005) until about 3 weeks ago. I want it to be clear that I didn't make any
video card/new power supply) until I started to have this problem. I would
appreciate any help on this
matter. Greg T

They answered with this reply:

No Video Signal and No POST When Powered On

If your system doesn't send a signal to the monitor when it's powered on,
there are several potential causes. Your problem could lie within the
motherboard itself, or with a component installed on the board. It could
even be caused by grounding or EMI. Please follow these steps to


Check that the MB is not picking up EMI (Electromagnetic Interference), or
improperly grounding against the case. Please remove the MB from the case
and set it up DIRECTLY on the cardboard box it came in or some other
non-static, non-conductive surface, like a telephone book. Install the power
supply, processor (with heat sink and fan), memory and video card. If the
motherboard has the vocal POST feature activated, plug speakers into the
onboard audio jacks. If the board doesn't have this feature, or if it's
deactivated, make sure to install a case speaker on the board.

If the system POSTs then your problem is caused by grounding. You will need
to electrically isolate the MB from the case to correct it. To do this, you
will need to use electrical tape to cover the brass stand-offs that support
the MB, and insert paper washers between the heads of the mounting screws
and the MB. The red paper washers should be included with your case
hardware, or they can be purchased at Radio Shack or a computer store.
Make sure that no stand-offs are placed in a spot where the motherboard
isn't designed to be grounded, as some cases will have different standoff
locations to accommodate different styles of motherboards. Also check that
there are no other metal objects that could contact the motherboard or any
other electrical device attached to the system, such as a metal burr, loose
screw, metal rod, or any other object that could cause a short.


If the system still won't POST then determine which, if any, error code is
being generated. Motherboards with the vocal POST feature will "tell" you
what is wrong, i.e. "System Failed VGA TEST" or "System Failed CPU Test."
Beeps codes and their meanings can be found in your User's Manual.
Investigate any error messages (System Failed VGA Test, or one long and
three short beeps, indicates a possible bad video card, etc.) you receive in
this fashion.

If the system gives no POST error codes while refusing to boot, follow these

Remove the memory entirely and boot the system to force a POST error. The
beep code for no memory is 1 long beep, or several long beeps in an endless
loop (or you may hear "System Failed Memory Test" in a repeating loop). If
you do get an error, try a different stick of memory to see if that fixes
the problem. If it does, the original stick of memory may be bad. If it
doesn't, you may have a problem with your MB. Proceed to the Power Supply
troubleshooting procedures.

If you don't get any POST errors, remove the CPU from the board and boot it
again. If you have a MB with the vocal POST feature, you should hear "No CPU
Installed" or "No CPU Found" repeating error messages. If you hear these
messages, it's very likely that you have a bad processor. If you don't hear
these messages, you may have a problem with your MB. Proceed to the Power
Supply troubleshooting procedures.

Next, test the CPU. You want to test the CPU in a known good, working MB. If
you test on a motherboard that you know works and the CPU still does not
work, you know you have a bad CPU. If it works correctly on the second
motherboard, you know that your CPU is not the problem.


Please check to make sure your power supply can supply enough power to your

If the CPU is below 700 MHz, the power supply we suggest as follows:
300 Watts with +5 Volt @ 25 amps, +12 Volt @ 10 amps, and +3.3 Volt @ 14

If the CPU speed is above 700MHz, the power supply we suggest as follows:
350 Watt with +5V @ 30 amps, +12V @ 12 amps, and +3.3V @ 22 amps.

If the CPU speed is above 2000MHz, the power supply we suggest as follows:
350 Watt with +5V @ 30 amps, +12V @ 15 amps, and +3.3V @ 22 amps.

For Dual Intel MB, Min. P.S. should be:
350 Watt with +5V @ 35 amps, +12V @ 15 amps, and +3.3V @ 22 amps.

For Dual AMD MB, Min. P.S. should be:
400 Watt with +5V @ 38 amps, +12V @ 15 amps, and +3.3V @ 20 amps.

Please note that these are only suggestions and the actual size of the power
supply may need to be larger than we suggest. Also, depending on the
configuration of your system, you may need more power than listed above.
Running multiple hard drives, CR-ROM drives or other accessories may
increase the power requirements of your system.

At this point your system should be stripped of most of its components. Try
installing a different power supply of equal or greater power to see if the
system boots. If your original power supply is under powered then one with
greater wattage should start your system. If your system still won't POST,
your problem is most likely caused by the motherboard.

If you are in the USA or Canada, please call our RMA department at
510-739-3777 option 3. Please have the serial number of your ASUS product
handy when you call. The RMA staff will assist you with repairing or
replacing your motherboard.

Please do not respond to this email. If you need further assistance please
have your case number ready, then contact Technical Support at 502-995-0883
(M-F 8:30 AM - 8:00 PM EST).


Jon V.
ASUS Technical Support

I don't know if this will help you but as far as my problem it pretty much
has disappeared without doing anything. I don't get the CPU speed message in
the BIOS at startup anymore. What happens every so often is that the
computer will not initialize the video after a little hard drive activity at
bootup(it just sits there with a blank screen/not sure if there is a
blinking cursor or not...will have to check the next time it happens). All I
do is press the reset button and the system loads. hope this helps, Greg T
"Son Of LaL" <mpick@xxxxxxxxxxxxxxxxx> wrote in message
> i have a friends pc with an a7v600-x m/b and when it turns on it initially
> goes straight to the bios screen which says the cpu speed was incorrect at
> last power on and then when i save and exit the bios it loops around after
> the post screen back to resetting and starting again and again. If you
> it off either with the power button or at the wall it goes back to saying
> the cpu speed was incorrect at last power on. I have checked the memory
> hdd in my machine and they work fine. I`ve also updated the bios to the
> latest one successfully so not sure where the prob lies. If the cpu was
> faulty surely the machine would not boot at all or would give an eror
> Any help appreciated.
> Martin.