BSOD when rebooting/restarting

Computer wouldn't even turn on earlier... got no beeps and no POST/BIOS screens. Removed the #2 stick... got the beeps but nothing on screen.

After tinkering around and moving memory (testing one stick at a time... one slot at a time), I've managed to turn on the computer with only one stick in the #2 slot. Is it possible that I have a memory problem that's not being picked up by Memtest86+? G.Skill has a lifetime warranty on their memory, so I might try just getting these replaced.

But I don't know if the sticks are the problem, or if it's the ports on the board. One thing for sure, moving memory around or removing a stick definitely makes a difference when it won't boot up (long beeps, see previous post).
 

My Computer My Computer

OS
Windows 7 Home Premium 64 bit
CPU
AMD Athlon II x4
Motherboard
Gigabyte 870A UD3
Memory
G.Skill DDR3 2x2
Graphics Card(s)
Gigabyte w/ ATI Radeon 4700 series
Hard Drives
Seagate Barracuda 1Tb
PSU
Rosewill 500w
Case
Rosewill Challenger
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