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New system doesn't post, won't even make it past the cpu, mobo, psu stage

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April 22, 2013 8:04:31 PM

So the first time I booted up my system, I got absolutely nothing--no power to anything whatsoever. My motherboard has an 8 pin connector for the cpu, and I have a 4 pin fitted with my psu, and from what I could tell from the manual, I plugged it into the correct area (pins 1-4).

I tried unplugging the cpu power to see what would happen, and while the system didn't post, I got some signs of life (cpu fan was on, case fans were on, hdd and disk drives were running, etc...) but still no post, and no beeps.

I then attempted moving the cpu power connection to pins 5-8. All that accomplished was putting the system into a continuous reboot cycle, and more alarmingly, the cpu fan would stop running after the first few seconds. Obviously I did not play with that trail for very long...

To simply things for you guys even further, I have breadboarded the mobo--the only things I have connected to the mobo are the PSU and the CPU. Even with only those two components, the outcomes are identical to those described above.

The specs are as follows:
550w Thermaltake PSU
AMD Phenom II X4 965
Gigabyte GA-970A-D3 Motherboard
8Gb Corsair Dominator GT DDR3 2000mhz
Sapphire AMD Radeon 7850

I appreciate any help!
a c 147 à CPUs
April 22, 2013 8:31:16 PM

you need ram in a mb to even get it to post. and your ram is DDR2, which will work in an AM3 MB but not an AM3+ like you have.

you have the wrong ram, it won't post till you get some DDR3
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April 22, 2013 8:36:27 PM

I've tried it with ram. And I shouldn't need ram to get it to just power on. I'll try to reexplain, even with 2 sticks of ram, 1 stick of ram, ram in different slots, no ram, etc... as long as the the 4pin cpu power connector is plugged into the bottom half of the 8 pin power connector, absolutely nothing happens. If I plug the cpu power connector from the psu into the top half, I still get no post and an endless reboot cycle, but the system at least makes noise. If i completely disconnect the cpu power, no post, but things don't go into that scare rebooting cycle.


Also the ddr2 was a typo. I have ddr 3. In response to the second post, is it that simple? I read that this should be possible with a 4pin.
a c 147 à CPUs
April 22, 2013 8:37:53 PM

ITendtoWeez said:
I've tried it with ram. And I shouldn't need ram to get it to just power on. I'll try to reexplain, even with 2 sticks of ram, 1 stick of ram, ram in different slots, no ram, etc... as long as the the 4pin cpu power connector is plugged into the bottom half of the 8 pin power connector, absolutely nothing happens. If I plug the cpu power connector from the psu into the top half, I still get no post and an endless reboot cycle, but the system at least makes noise. If i completely disconnect the cpu power, no post, but things don't go into that scare rebooting cycle.


fair enough.
April 22, 2013 8:42:29 PM

I might as well give the adapter a try first considering it's such a cheap and stress-free option.
a b à CPUs
April 22, 2013 8:49:07 PM

I don't see anything in the manual that says you can use a 4-pin connection instead of the 8-pin or 2x4 pin connector. What model is that thermaltake power supply? There are many cheap thermaltake power supplies that are horrible and create enough noise on the rails that it can damage components.
http://www.eggxpert.com/forums/thread/323050.aspx
April 22, 2013 9:15:21 PM

It's in the Tier 4--a Thermaltake TR2. Are you suggesting that it has actually damaged something, or are you just saying it would be best to just buy a new power supply in general?
a b à CPUs
April 22, 2013 9:25:02 PM

The TR2 is actually a tier 5, which is the replace asap tier. While it may not be the problem now it will be(not could be WILL be) down the road and when that happens god knows what other hardware it will take with it. If you are on a budget get this power supply http://www.newegg.com/Product/Product.aspx?Item=N82E168... its a much better unit and has the needed 8pin(4+4) eps connector for the motherboard. when building a computer the power supply is thee most important part and the most overlooked by new builders. Alot of new builders usually learn this lesson the hard way when it pops and they have to build a new system because the old one is now a smoldering ruin.
April 22, 2013 9:26:53 PM

I appreciate it! Hopefully this will solve the current problem and preempt a future one.
!