A790GMH/128M - will not boot cold, but will boot after 30 Minutes

[yello]

I have a problem with the A790GMH/128M (with Win7-64) - it will not boot at first...

In detail:
When I start the fan runs, but no booting. Screen stays black

When I let the PC stay like that for some time (not less then 30 Minutes!) and reboot it will boot normally
After it started once it can restart without problem

First I thought maybe related to the power supply, but changing the power supply with an other PC did help at all > same problem.

Any hints for me what that problem could be?

PS: Just noticed, even when under power with the fan spinning and the screen black the yellow heatsink ist getting very hot.

[MarkJohnson]

Re: A790GMH/128M - will not boot cold, but will boot after 30 Minutes

You yell heatsink is or isn't getting hot?

Did you try clearing the cmos?

Have you updated the BIOS?

List as many system system specs you can. Both make and model number.

-=Mark=-

[yello]

Re: A790GMH/128M - will not boot cold, but will boot after 30 Minutes

Thanks for the feedback!

The yellow heat sink is getting very hot.

AMD 7850 2.8GHz (not overclocked)
4Gb RAM

BIOS: A790GMH/128M P1.70

I didn't clear knowingly the CMOS yet, but yesterday I took out the battery to have check (was 3.3V). Isn't taking out the battery = CMOS clearing?

[MarkJohnson]

Re: A790GMH/128M - will not boot cold, but will boot after 30 Minutes

what type of CPU heatsink is on your computer? Is it a vertical one like a heatpipe type? If so your yellow heatsink doesn't have a fan on it unless you added one.

Taking the battery out sometimes will clear the cmos. sometimes there is enough power in your system to retain settings. Did it give you a message saying the settings were reset?

If you have a fan you can use to place on the heatink, test to see if it helps any.

The damage may have already happened, that's why it has to warm up before it works. I had that happen on 975x board when conroe's first came out and the new heatpipe heatsinks. I got a fan for it, but I had to overvolt my system for it to be stable, but it still would crash sometimes. Hopefully we can fix you up.

also, how old is your system?
-=Mark=-