ginnis24
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Bad Power Suppy?
I just built a new pc and it wont turn on! I have;
AMD Phenom II 940 Quad Core 3.0GHz
Gigabyte GA-MA790GP-UD4H MOBO
G.Skill 1066 DDR2 Memory 2X2GB
PSU Rosewill DR-8500BTX 500W.
I installed everything, I have no Hard drive hooked up to it yet, I turn it on the fans start going but seem a little slow. The board has onboard graphics so I am plugged in via RGB nothing fancy. Monitor neverer does anything ever! It will not load to the BIOS or I cant see it maybe? I took the heatsink and fan off the CPU and turned it on the CPU is not getting hot at all its not doing anything and the system doesn't shut off, it should since i took the heatsink and fan out and unplugged it right?
Does this sound like a PSU, Motherboard, or Processor issue. Everything is brand new and I just dont know what to return first?
AMD Phenom II 940 Quad Core 3.0GHz
Gigabyte GA-MA790GP-UD4H MOBO
G.Skill 1066 DDR2 Memory 2X2GB
PSU Rosewill DR-8500BTX 500W.
I installed everything, I have no Hard drive hooked up to it yet, I turn it on the fans start going but seem a little slow. The board has onboard graphics so I am plugged in via RGB nothing fancy. Monitor neverer does anything ever! It will not load to the BIOS or I cant see it maybe? I took the heatsink and fan off the CPU and turned it on the CPU is not getting hot at all its not doing anything and the system doesn't shut off, it should since i took the heatsink and fan out and unplugged it right?
Does this sound like a PSU, Motherboard, or Processor issue. Everything is brand new and I just dont know what to return first?
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ASKER
Oh Steve its working. You are the man bro. I plugged in the 4 pin and its going.
The 4 pin and 8 pin you speak of are for CPU power.
They use more pins to handle more amps to keep from melting wires or burning pins.
Your processor is 125 watts.
Assuming your VRM is 80% efficient (which on the good side) the power to the motherboard for CPU power is bit over 156 watts.
At 12 volts that's 13 amps.
With a 4 pin connector (which only has two +12v paths) that is 6.5 amps per wire and per pin.
Not sure about the wire (depends on size) but those pins are only rated for 5 amps each.
You need to get an adapter so you are spreading the CPU power over more pins.
.
They use more pins to handle more amps to keep from melting wires or burning pins.
Your processor is 125 watts.
Assuming your VRM is 80% efficient (which on the good side) the power to the motherboard for CPU power is bit over 156 watts.
At 12 volts that's 13 amps.
With a 4 pin connector (which only has two +12v paths) that is 6.5 amps per wire and per pin.
Not sure about the wire (depends on size) but those pins are only rated for 5 amps each.
You need to get an adapter so you are spreading the CPU power over more pins.
.
ASKER
Thanks for the help Steve.