F5F Stay Refreshed Hardware Desktop Are there two DDR motherboards placed side by side, or is there another configuration?

Are there two DDR motherboards placed side by side, or is there another configuration?

Are there two DDR motherboards placed side by side, or is there another configuration?

K
K_p12
Junior Member
9
05-22-2021, 12:53 AM
#1
I recently ordered an MSI z690 Tomahawk motherboard and i7-12700k for a new build. I did a bread board assembly with the CPU and ram, but it would not boot. Eventually, I found if I removed the CMOS battery and replaced it the system would start, but only until the PSU was disconnected. If I disconnected the PSU, if would not boot until I removed and replaced the CMOS battery again. I assumed it was a bad MB and RMA'd it. I received my replacement MB today. Since the MB I previously purchased was OOS, I ended up upgrading to an MSI z690 Carbon. I again tried bread boarding with the CPU, 1 stick of ram, and like the last board nothing happens when I short the power pins. No lights, no fans, absolutely nothing. I tried resetting the CMOS on the this board, and still nothing, so it won't boot at all. The PSU is the only thing I kept from my previous build, so I'm suspecting it could be the failure point. It's an old 650W Seasonic, and it worked when I took apart my old system. I shorted pins 16/17 on the PSU with it disconnected from the MB and the fan kicks on for a second, so the PSU is at least functional. The standby voltage appears to be out of spec - from what I read it should be at least 4.75V, but it's 4.5V, while the rest of the voltages look OK. I'm not sure if the PSU the problem, but it's old, so I have ordered a replacement just to be safe. Any opinions on whether this is another DOA motherboard or another issue? Is there anything else I should try?
K
K_p12
05-22-2021, 12:53 AM #1

I recently ordered an MSI z690 Tomahawk motherboard and i7-12700k for a new build. I did a bread board assembly with the CPU and ram, but it would not boot. Eventually, I found if I removed the CMOS battery and replaced it the system would start, but only until the PSU was disconnected. If I disconnected the PSU, if would not boot until I removed and replaced the CMOS battery again. I assumed it was a bad MB and RMA'd it. I received my replacement MB today. Since the MB I previously purchased was OOS, I ended up upgrading to an MSI z690 Carbon. I again tried bread boarding with the CPU, 1 stick of ram, and like the last board nothing happens when I short the power pins. No lights, no fans, absolutely nothing. I tried resetting the CMOS on the this board, and still nothing, so it won't boot at all. The PSU is the only thing I kept from my previous build, so I'm suspecting it could be the failure point. It's an old 650W Seasonic, and it worked when I took apart my old system. I shorted pins 16/17 on the PSU with it disconnected from the MB and the fan kicks on for a second, so the PSU is at least functional. The standby voltage appears to be out of spec - from what I read it should be at least 4.75V, but it's 4.5V, while the rest of the voltages look OK. I'm not sure if the PSU the problem, but it's old, so I have ordered a replacement just to be safe. Any opinions on whether this is another DOA motherboard or another issue? Is there anything else I should try?

B
Bosskj
Member
100
05-23-2021, 03:11 AM
#2
I’d try it again after the new PSU arrives to confirm. There’s a chance your CPU or RAM might also be the issue.
B
Bosskj
05-23-2021, 03:11 AM #2

I’d try it again after the new PSU arrives to confirm. There’s a chance your CPU or RAM might also be the issue.

X
XAcmedX
Member
60
05-24-2021, 08:50 AM
#3
It seems the PSU is functioning correctly. The new unit powered on immediately after plugging it in without any additional components, indicating the issue may have been resolved. I’m puzzled about why this setup worked with my older system and could also fit the previous motherboard if I cleared the CMOS. It’s possible the newer boards verify the voltage supply, and since one was non-functional, it stopped the PSU from starting as a safety measure.
X
XAcmedX
05-24-2021, 08:50 AM #3

It seems the PSU is functioning correctly. The new unit powered on immediately after plugging it in without any additional components, indicating the issue may have been resolved. I’m puzzled about why this setup worked with my older system and could also fit the previous motherboard if I cleared the CMOS. It’s possible the newer boards verify the voltage supply, and since one was non-functional, it stopped the PSU from starting as a safety measure.