Bad CPU or MB?

Amakuma

Amakuma

Amakuma

Associate
Joined
26 Jan 2010
Posts
291
Need some help deciding which to RMA,

Put together a new system yesterday

i5 750
Biostar T5 XE CFX-Sli
4GB G.skill 1600MHz PC3-12800C8
HD4850 512MB
560 watt SilverStone PSU

System will not POST. Phase lights come on at the top and fans spin up.
The RAM, GPU and PSU have been confirmed working, I tested the system with another PSU and still no joy. Took the system out the case and barebones tested to make sure nothing was shorting it and still no good. The biostar manual says that the diagnostic light if they dont come on at all suggests a CPU/chipset error (not very clear). The fact the phase power lights come on suggest the mobo might not be the problem.
 
Tried a single memory module in various slot's also double check there are in the correct slots as I did this on my build.

8 pin for cpu power connected, often gets missed.

Try a trusty CMOS reset :)
 
Reseated the CPU and inserted a single Ram stick, now Im getting only 3 of the 6 phase lights, and a diagnostic LED telling me I have a VGA error, the graphics card was working fine in another PC moments ago

UPDATE

tried a different GPU, same VGA error with on half phase indicator lights on, gonna try with a different PSU
 
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