System acting weird after installing GTX 580

Zoombas

Right off the assembly line
Current specs:-
i7 920 @ stock
X58A-UD5 rev1.0 (F7 BIOS) BIOS was updated from F6 to F7 last year Nov 2011.
EVGA 9600GT 1GB GDDR3 @ 2-way SLI
TX650W (old one, bought 4yrs ago)
Lancool PC-K62
M2700HD (using DVI cable)
6GB DDR3 GSkill 1600MHz 9-9-9-24 @ 1.6V (slots used are 1,3,5 - triple channel)
Noctua NH-D14
Win 7 Ultimate x64

Changes done:-
All my hardware are 4yrs old except GTX 580 which is only 10 months old.
Removed both 9600GT & installed EVGA GTX 580.

Problem:-
Bios detects all 3 RAM modules. But usable is only 4GB. The same is shown via System Info when you're in Windows > Right-click My Computer > Properties

Boot process goes till - "Verifying DMI pool data" > "Detecting DRAM size..."
and then restarts automatically 3 times, sometimes 4. On the 4th or 5th run, it finally goes till windows & this time you only get "Verifying DMI pool data". The "Detecting DRAM size..." line does not appear.

I googled this & came up with these - results

Haven't had time to reseat the RAM sticks. Will do it during the weekend. Helluva time in office this week.
Removed GTX 580 & re-installed 9600GT in SLI. The problem persisted which was totally unexpected. Had a true WTF moment last night.

Any quick suggestions which I can do tonight or any weekday?
 

tkin

Back to school!!
Reinstall the RAM, they are not connected properly, happened to me before, you have to push them in hard, sometimes the clip will lock but ram won't get seated properly
 
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