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PC will Cold Boot but won't Warm boot?
Hello,
Last week 2 memory slots in my PC quite working. While trying to determine if it was the RAM or the slots (suppose memory controller is more correct) I Cleared CMOS, swapped memory modules & right about then the PC quite restarting. Click on restart & windows shuts down, monitor goes blank but the PSU never powers off. Before I would hear the PSU power cycle just before the PC restarted. At least I think it was the PSU, a mechanical restart with a fan. There's only one case FAN & the heatsink fan, but I don't think that's it. I suppose it could be the case fan.
It does however shutdown just fine. Click shutdown & Windows shuts down & powers the PC (PSU) off.
Since the memory slots were toast I purchased a new MB, that did correct the memory issue - all RAM is now accounted for in Windows. However the restart condition persists. I updated the BIOS, cleared CMOS again & removed/replaced the battery. I made triple sure that all connections are secure.
Power scheme is set to balanced & I have never enabled hibernation on this PC.
In the BIOS Remote Wakeup & Auto Power On are disabled. ACPI mode is S3 & AC recovery is OFF.
A little research on Shutdown vs. Restart indicates a Shutdown results in a Cold Boot whereas a Restart results in a Warm Boot:
For a shutdown and start the last thing is turning off power to the system board. When the system is turned on the CPU boots and passes control to the bios. For a restart the last thing is issuing a warm boot command to the CPU. The CPU then passes control to the bios.
Shutting down (cold boot) cuts the power to memory, which would clear things like RAM and such. It also cuts power to the peripheral devices, whereas restarting "may or may not" completely do this. When you restart your PC, the hard drive does not stop spinning. You must remove power completely from a computer to make everything truly clear.
It sounds to me like during a restart the command telling the PSU to restart is not getting there. During a shutdown the command to the PSU telling it to power off is getting there.
I'm not even sure what to look at. I suppose the PSU could be the culprit but something in the BIOS seems more likely.
thanks for any help :)
Last edited by newpgm; 14 Oct 2013 at 13:59.