GA-MA790FX-DQ6 will not boot

[bobhatton.com]

System has been working for over two years with no problem but last sunday it did not boot. I have now fitted a repaired MB with new CPU and it worked for one day and now that will not boot.

What is going on?

Thanks

Bob

[Pottypete]

hi,
What failed on the first mobo?
PSU Ok?
Memory tested ok?
cheers

[bobhatton.com]

I do not know what failed on the first MB, sending it back for repair today.
Yes PSU working well and so is the memory.

I have two MSI RX3800 cards set up in cross fire and have had problems with them after I updated the drivers.
The second MB failed after I refitted the second MSI card and was trying to get the screens the right way round, ie monitor and HD TV. I was starting and stoping the computer a number of times then iw would just not start one time. All the cooling fans run including the CPU one.

Bob

[oggmonster]

Did you run a memtest on the memory, or try it in another machine etc?

[orrgii]

I'd try to swap memory sticks. Usually that' s the culprit when motherboard stops working for no reason.