Building new Computer CPU Issue

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customer dropped off parts for a new computer build , he tried to build it himself and it would boot but shutoff after 5 seconds, tried thermal paste on original processor and still no go. Had a different processor laying around that I tried in it and it worked fine, thinking the customer might have fried the first CPU I told him to get a replacement, which he did. I go to put it in yesterday and it also just boots up for a few seconds and shuts down. the cpu is compatible with the motherboard so im at a loss for the reason for it not to work :confused:

The motherboard is a gigabyte GA-EP45C-DS3R (rev. 1.0) Intel® P45 + ICH10R Chipset

The is the webpage for the Motherboard : http://www.giga-byte.com/Support/Motherboard/CPUSupport_Model.aspx?ProductID=2871

This is the list of Supported CPU's : http://www.giga-byte.com/Support/Motherboard/CPUSupport_Model.aspx?ProductID=2871#anchor_os

The CPU Model : Core 2 Quad Q9450 LGA775 2.66 GHz, 12MB L2 Cache Total, 1333 MHZ FSB, 45nm

The Memory Module : OCZ Gold 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Dual Channel Kit Desktop Memory Model OCZ3G16004GK

700watt antec power supply
 
Are you 100% sure you've made ALL the power connections that need to be made to the motherboard and they are all pushed down firmly and in the right way round?

Had a similar issue with a personal PC I built last year after an hour or so I found that 1 little 4-pin mobo power connector wasn't securely in its socket - worked fine after that :)
 
I narrowed it down to a bad ddr3 ram slot

it boots if one of the ddr3 ram sticks are in the slot closest to the cpu
but if i put the second one in to the slot farthest from the cpu is fails to boot

swapping both chips produces the same result

tested out of the case also to make sure there was no grounding issue and still same results

so the customer is lucky and has a 3yr warranty from gigabyte, I called them to verify my findings and they said to RMA it
 
yea real odd, but the gigabyte tech support concurred with the diagnosis
he tried telling me to try everything I had already done to test to make sure
and at the end he said yea its probably a bad slot lets RMA it
 
wow a bad ram slot? Ive never had that happen to me before.. wow....

My desktop computer has an Asus motherboard in it that developed a bad RAM slot. Any RAM I put in it will work for 1 or 2 days and then the slot will damage the RAM. I am guessing a capacitor or something for it has failed but they look fine so I have no clue where to start (A8N-SLI board, pretty old)
 
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