T430 with original 8 meg of ram will not boot

Hi,

The laptop is stuck to the thinkpad splash screen and not able to even go in the bios. 

I had to remove the original 2 x 4G (samsung 2Rx8 PC3-12800s-11-10-f2) and put in a spare 2G ddr3 that i have and the laptop boot fine. Both USB port, sd card and DVD work great but with only 2G of ram.

I tested the 2 x 4G ddr3 into another laptop (dell latitude) and the ram is working fine.

I've updated the bios to 2.74 and the same thing happen.

When i go into the bios, load setup default and change in Startup UEFI Only then i can see the 8G of ram into the bios but i'm unabke to boot the hard drive. I get this error: 2100: Detection error on HDD0 (Main HDD)

Any help would be appreciated.

Thanks