Rig motherboard won't power on

[wetblanket]

I had my 'rig' running well since January, all new components. I had the components precariously placed on my patio table indoors (no frame, just lying loose) - ran without problem. With the nice weather here, it was time to bring the patio table outside so I powered the rig down and dismantled everything.

I got a new shelving unit (wood), so started to put things together again. I attached the mainboard ATX power connector (standard 24 pin), but forgot to attach the ATX CPU power connector (8pin), didn't add any GPUs/risers yet. I hit the power switch, the CPU fan turned for less than a second, then the system shut down. I then noticed I forgot the CPU power connector - so I connected it. Now it won't power on at all, no fan movement whatsoever.

Nothing looks 'wrong' on the motherboard. I tried it with a single PSU. Switched to the other PSU. I tried a backup power switch. Attached a monitor and USB keyboard. Tried shorting the CMOS reset jumper. Nothing yet.

Specs:
Biostar BTC+ 8GPU motherboard
2 EVGA 850W P2 PSUs

- not a factor (yet?)
6x asus rog 1070 GPUs
PCIe risers

Any ideas?

[1715539731]

1715539731

[1715539731]

1715539731

[1715539731]

1715539731

[1715539731]

1715539731

[smoolae]

You can try to boot it with only 1 RAM stick and CPU installed. Connect your monitor straight to MOBO's video output and hope for the best.

Take out everything and reseat, be careful not to drop CPU or bend its pins. Also be sure to connect CPU fan to MOBO or your rig won't boot!

I have read things like this before and usually, sadly, you have to RMA your board

[wetblanket]

You can try to boot it with only 1 RAM stick and CPU installed. Connect your monitor straight to MOBO's video output and hope for the best.

Take out everything and reseat, be careful not to drop CPU or bend its pins. Also be sure to connect CPU fan to MOBO or your rig won't boot!

I have read things like this before and usually, sadly, you have to RMA your board

Yeah, tried all of those things and nada - still doesn't work. Crap.

[leonix007]

Now it won't power on at all, no fan movement whatsoever.

Keypoints for this would be PSU, connectors and mb power switch

if those things are already checked

sad to say, have to rma instead