asrock K8M800 - kb flashes but no video

[aryzhov]

Hello All,

I bougt a cheap bundle of K8Upgrade-VM800 Asrock motherboard with
Sempron CPU and cooler. It came already assembled,
so I just had to install a 1GB DDR400 DIMM and a new 350W ATX PSU
for my old minitower.

Now, when I poweron the thing, the 3 keyboard LEDs flash,
but there's no beep (even though the speaker jack is connected
correctly),
and nothing comes out on the built-in VGA port.
The HD connected to the first ATA socket, spins up but heads never
click
coming out, the CD drive connected to the second ATA socket,
has the LED permanently on, even though it sure is a good drive
(worked in the same box with previous MBoard)

Anyway, I disconnected HD and CD from MB and PSU, still no luck.
Checked all the jumpers many times - they all are set correctly.
Cleared CMOS by shorting the clear-CMOS-jumper.
What else? Is it a MB or CPU that's bad?

Thanks,
Andrei

 

[pjdd]

Hello All,

I bougt a cheap bundle of K8Upgrade-VM800 Asrock motherboard with
Sempron CPU and cooler. It came already assembled,
so I just had to install a 1GB DDR400 DIMM and a new 350W ATX PSU
for my old minitower.

Now, when I poweron the thing, the 3 keyboard LEDs flash,
but there's no beep (even though the speaker jack is connected
correctly),
and nothing comes out on the built-in VGA port.
The HD connected to the first ATA socket, spins up but heads never
click
coming out, the CD drive connected to the second ATA socket,
has the LED permanently on, even though it sure is a good drive
(worked in the same box with previous MBoard)

Anyway, I disconnected HD and CD from MB and PSU, still no luck.
Checked all the jumpers many times - they all are set correctly.
Cleared CMOS by shorting the clear-CMOS-jumper.
What else? Is it a MB or CPU that's bad?

Did you plug in the 4-pin power supply connector ? I mean
the connector that plugs on to a separate block near the
CPU. This is not the same as the additional 4 pins that are
sometimes provided for a 24-pin ATX connector. The latter
4 pins are sometimes provided as a detachable block to make
the PSU compatible with motherboards that come with 20-pin
connectors.

IIRC, the separate 4-pin connector is located near the top
left-hand corner of your motherboard.

 

[aryzhov]

Did you plug in the 4-pin power supply connector ? I mean
the connector that plugs on to a separate block near the
CPU. This is not the same as the additional 4 pins that are
sometimes provided for a 24-pin ATX connector. The latter
4 pins are sometimes provided as a detachable block to make
the PSU compatible with motherboards that come with 20-pin
connectors.

IIRC, the separate 4-pin connector is located near the top
left-hand corner of your motherboard.

Yes, the PSU has a 24-pin main plug with a detacheable
4-pin part (the mobo main power socket is 20-pin),
PLUS there's one more separate 4-pin plug.

The detacheable part has red-orange-yellow-black wires,
whereas a separate 4-pin ATX plug has two yellow and two black wires.
I guess the latter is a correct one to plug into the ATX socket.

If I don't plug it in, or plug a detacheable 4-pin part into ATX
socket,
the fan doesn't spin up and KB doesn't blink.

With 2yellow+2black ATX plugged in instead, the fan spins up,
the KB blinks, but there's no beep.

Cheers,
Andrei

 

[Rod Speed]

Yes, the PSU has a 24-pin main plug with a detacheable
4-pin part (the mobo main power socket is 20-pin),
PLUS there's one more separate 4-pin plug.

The detacheable part has red-orange-yellow-black wires,
whereas a separate 4-pin ATX plug has two yellow and two black wires.
I guess the latter is a correct one to plug into the ATX socket.

If I don't plug it in, or plug a detacheable 4-pin part into ATX
socket, the fan doesn't spin up and KB doesn't blink.

With 2yellow+2black ATX plugged in instead, the
fan spins up, the KB blinks, but there's no beep.

You may well have killed it when you plugged
that last one into the end of the 24 pin connector.

That plug has two 12V lines on it, the yellows.

The end of the 24 pin connector has all of 5V,
3.3V and 12V pins, the non black colors.

 

[aryzhov]

You may well have killed it when you plugged
that last one into the end of the 24 pin connector.

I did it yesterday only, after having trying this and that for a week
with jumpers and CMOS reset. In fact, nothing has changed after
this crude experiment - it still blinks with KB lights on poweron,
and the CPU fan spins up.