Earlier this week my desktop PC I build about 4 years ago would not turn on. While plugged in I heard a high-pitched squeal coming from the PSU, even when all cables were removed from the mobo and components. I figured the PSU was bad, so I just replaced it.
Old PSU was an Antec Smart Power 500W unit that was included the the case I used in my build 4 years ago. I just got a new Antec EarthWatts 430W PSU as a replacement.
I hooked up everything to the new PSU - still no joy. I see the green LED on the mobo, but no power on.
So I went about testing both PSU's using a multimeter. Started with the new PSU. Jumped pin 15 and 16 on the 24-pin connector, but nothing happened on the PSU itself. No fan running or nothing. With 15 and 16 jumped, I checked voltage to the #24 ground pin across all the + DC voltage pins. Everything checked out.
Next I tried the old PSU. Same procedure. But on the old PSU, I only got voltage on the #9 pin, nothing else.
With the new PSU connected to everything, I checked the power switch on the case. I tried shorting the pins on the mobo itself where the power button wires connect. Still nothing.
I have 2x 1GB sticks of RAM. I tried switching those out, trying to power on with only one stick installed at a time in the Channel A DIMM 0 slot. Still nothing.
Anyone have any ideas? Mobo taken a dump maybe? Is it possible that my brand new PSU is DOA? Shouldn't its fan at least have come on when jumping #15 and #16 pins on the harness?
Old PSU was an Antec Smart Power 500W unit that was included the the case I used in my build 4 years ago. I just got a new Antec EarthWatts 430W PSU as a replacement.
I hooked up everything to the new PSU - still no joy. I see the green LED on the mobo, but no power on.
So I went about testing both PSU's using a multimeter. Started with the new PSU. Jumped pin 15 and 16 on the 24-pin connector, but nothing happened on the PSU itself. No fan running or nothing. With 15 and 16 jumped, I checked voltage to the #24 ground pin across all the + DC voltage pins. Everything checked out.
Next I tried the old PSU. Same procedure. But on the old PSU, I only got voltage on the #9 pin, nothing else.
With the new PSU connected to everything, I checked the power switch on the case. I tried shorting the pins on the mobo itself where the power button wires connect. Still nothing.
I have 2x 1GB sticks of RAM. I tried switching those out, trying to power on with only one stick installed at a time in the Channel A DIMM 0 slot. Still nothing.
Anyone have any ideas? Mobo taken a dump maybe? Is it possible that my brand new PSU is DOA? Shouldn't its fan at least have come on when jumping #15 and #16 pins on the harness?