New sb build won't boot with 4 sticks ram

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I have just put together a new build but it will not boot with 4 sticks of ddr3 in.

I have swapped the sticks round and they all work fine in slots 1 & 2 but put any in slots 3 and 4 and it will fail to boot. Switches on for about a second then off again in a loop. Tried 1.5v and 1.6v different timings and mhz but still the same.

Any thoughts people??

i7 2600K
Gigabyte P67A-UD4
4x2gb XMS3 (8GB)
GTX 480 soc
HX620
 
Tried 1 to 4 sticks and all voltages ok.

Its currently stripped out on the bench and seems to be running fine with all 4 sticks in..

Don't understand it. it running prime95 now for a hour or so and if passes will put in back in the case and try again..
 
Atom said:
Tried 1 to 4 sticks and all voltages ok.

Its currently stripped out on the bench and seems to be running fine with all 4 sticks in..

Don't understand it. it running prime95 now for a hour or so and if passes will put in back in the case and try again..
Click to expand...

Could possibly be something in the case causing a short circuit, when you took it out the case did you remove the cpu heatsink could possibly be too much/too little pressure causing the motherboard to bend.Apparently it's quite common place among intel chips because they don't use pins like AMD.

All seems very strange tho that it suddenly works outside the case
 
I am thinking a short myself. I haven't changed anything from it being in the case. Going to put in back in now so see how it goes..
 
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