Hello
So I am struggling with either a design flaw or a two bad PSU's or Mobo's.
I am following the troubleshooting tips and am breadboarding this out of the case - Mobo, CPU & PSU only. Maybe I am missing something else.
I have confirmed CPU & CPU Fan in a seperate PC.
In all three configurations - PSU1/Mobo1, PSU2/Mobo1, PSU2/Mobo2 - I get no fans spinning in either the PSU nor CPU fan. Mobo power LED is on.
No system beeps either.
When I disconnect the 20 pin harness and leave the 4 pin in the 24 pin connector, and then jumper the PSU Good signal on the 20 pin harness, both fans come on.
I find it difficult to believe I have gotten two bad Mobo's with the same failure mode. Many people on the egg have very positive experiences with both the PSU & Mobo.
I get the same symptoms with a memory stick and graphics card installed.
Here is my questions.
1. I am considering measuring the resistance between the PSU good and ground on the backside of the mobo where the connector pins come through. SHould I see continuity always or is that a switched circuit from some other part of the mobo
2. If all else fails would you try a different PSU vendor or Mobo Vendor? My preference is PSU as its cheaper .
3. Any other suggestions / checks gladly welcome.
Target system.
Mobo - M4A88T-M LE
CPU - AMD Phenom II X4 945 Deneb 3.0GHz Socket AM3 95W Quad-Core Desktop Processor HDX945WFGMBOX
Cooler - Stock cooler with artic silver paste
PSU - COOLER MASTER eXtreme Power Plus RS500-PCARD3-US 500W ATX12V v2.3 Power Supply
So I am struggling with either a design flaw or a two bad PSU's or Mobo's.
I am following the troubleshooting tips and am breadboarding this out of the case - Mobo, CPU & PSU only. Maybe I am missing something else.
I have confirmed CPU & CPU Fan in a seperate PC.
In all three configurations - PSU1/Mobo1, PSU2/Mobo1, PSU2/Mobo2 - I get no fans spinning in either the PSU nor CPU fan. Mobo power LED is on.
No system beeps either.
When I disconnect the 20 pin harness and leave the 4 pin in the 24 pin connector, and then jumper the PSU Good signal on the 20 pin harness, both fans come on.
I find it difficult to believe I have gotten two bad Mobo's with the same failure mode. Many people on the egg have very positive experiences with both the PSU & Mobo.
I get the same symptoms with a memory stick and graphics card installed.
Here is my questions.
1. I am considering measuring the resistance between the PSU good and ground on the backside of the mobo where the connector pins come through. SHould I see continuity always or is that a switched circuit from some other part of the mobo
2. If all else fails would you try a different PSU vendor or Mobo Vendor? My preference is PSU as its cheaper .
3. Any other suggestions / checks gladly welcome.
Target system.
Mobo - M4A88T-M LE
CPU - AMD Phenom II X4 945 Deneb 3.0GHz Socket AM3 95W Quad-Core Desktop Processor HDX945WFGMBOX
Cooler - Stock cooler with artic silver paste
PSU - COOLER MASTER eXtreme Power Plus RS500-PCARD3-US 500W ATX12V v2.3 Power Supply