Question No POST no power through USB

Aug 7, 2024
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My best friend brought me his computer to work on and get back up and running a couple of weeks ago. I went through it had him order ssd's, new case, cpu cooler, some fans and power supply. Granted what he has is quite old but for what little he will do on it would be enough we figured.

I will list everything below when I get through the issues. Now I got everything pulled out of the old case and cleaned up, cleaned and repasted the cpu and installed the cooler and planted everything into the new case. got everything hooked up and running, sounds great so far and it is. The old platter drive had windows 7 on it so I bought him a copy of windows 10 and got the machine up and running on W10 and got updates rolling. Now somewhere along the way something happened somewhere to turn everything to poo.

The machine is up and running, stable temps everything looked ideal for as old as the stuff is. But during a reboot it just would not post, no screen activity monitor goes directly into stand by mode, no power blip on the keyboard (NL/SL/CL) when you hit the power button, nothing!
So I started with clearing the cmos, pulled the battery, moved the jumper, held the power button etc etc then replaced the cmos battery just to put the nail in that coffin. Nothing, same result. Pulled the vid card, reseated, pulled ram tried 1 stick 4 times (4 Sticks), nothing. Swapped out video cards, nothing.

Now the crazy part I had an even older mobo/cpu combo laying around I knew worked last I had it assembled, went through all the same steps and still same exact results. Then I yanked the new PSU and went with the old one he had in his system, exact same results.
The mobo has an LED row at top to signal issues or errors, nothing. Everything perks by looks.
Am I just so bumfuzzled I can't see the forest for the trees or am I just crazy??!

Ok hardware:
New Stuff:
Case:
Be Quiet! Pure Base 600
2 140mm Be Quiet! fans up front
3 total 120mm fans in top and back
Thermaltake Toughpower GF A3 750W
TeamGroup 4TB SSD Primary 2 TB Secondary
UpHere UP1 Series Cpu cooler

Old Stuff:
MSI 990xa-gd55 Mobo
G.Skillz DDR 3 32GB Ram (4 Sticks)
AMD Phenom II Cpu
EVGA Geforce GTX 660Ti
Blue Ray Drive
DVD burner drive

Now if I've forgot anything let me know or ask or just shoot me.
 
I have this morning taken it completely apart, separated all cables and components. Now I'll reassemble piece by piece all over.
 
I have this morning taken it completely apart, separated all cables and components. Now I'll reassemble piece by piece all over.
It would be good to know the power supply voltages. Replacing the PSU doesn't necessarily prove that power is not a problem. You could have an open or a short somehere in the power circuits.
 
Well thats what led me to switching out the psu altogether, figuring if it was cable or psu related then that should have proofed out, but alas no.
But I guess if this doesn't make any headway I'll grab a multimeter.
 
Well thats what led me to switching out the psu altogether, figuring if it was cable or psu related then that should have proofed out, but alas no.
But I guess if this doesn't make any headway I'll grab a multimeter.
They are cheap and also useful for troubleshooting car electrical, home electrical, etc. Sometimes it's better to just take it to a shop.