Memory connundrum, please help!

Morning all,

Ok im at a loss at the moment. Ive just built a system from the parts in my sig and started getting random crashed when i had 2 sticks of 2gb G.Skill DDR2 installed. So ive been trying to troubleshoot but im getting random results from testing.....heres what ive tried using Memtest86+ v2.01.

1 - Stick A(thought to be good) in Slot 1, 10 passes, 0 errors
2 - Stick B(thought to be dodgy) in Slot 1, 10 passes, 0 errors
3 - Stick B in Slot 1, Stick A in Slot 3, Memtest would not run and crashed just as loading.
4 - Stick B in Slot 2, Stick A in Slot 4, 2 passes, 1071 errors (i kid you not!!!)

Currently running Stick B in Slot 2 on its own and it seems fine (1 pass, 0 errors when i left to go to work)?

From this it seems like Slots 3 and 4 are faulty as whenever theres a stick in one of these slots Memtest fails, but im a n00b when it comes to memory testing.

Could the sticks just not be working together properly? Is there something im missing???
Any help would be highly appreciated.

They are brand new G.Skill sticks:-

http://www.newegg.com/Product/Produc...82E16820231122

Im in the UK so got them from OverclockersUK.

Ive already sent the mobo back to Gigabyte once because of a corrupted BIOS which prevented post, dont really want to send it again as it cost £17($30) each time...

Any help or suggestions welcome Cheers! Buz.

Cheers bobbknight, ive had a few suggestions for different settings to get both sticks working together. If they dont work then its on to Gigabyte i guess...