[SOLVED] Need explanation for this.

[Soumyajit_1]

My system was running fine lately and even after installing a new gtx 1660 ti there was no issue. Today I kept my PC on sleep for an hour or so and after waking it up the screen froze completely on the lockscreen. Keyboard light was not on and nothing was working. So switched of the PC holding the power button. Restarted it and it turned on and went off repeatedly. So I removed all the power cable from the PSU and after 30 mins restarted it and it was doing the same thing. Then I removed a ram stick and restarted it. It ran like normal. Reinstalled the ram stick and it's normal again. Can anyone explain why did this happen.
Specs:
CPU: Intel i3-7100 (will upgrade later, waiting for LGA 1200 mid tier boards to release for the 10th Gen)
GPU: Nvidia MSI Gtx 1660 Ti Ventus XS OC
Memory: Crucial 2x8GB
PSU: Corsair VS550
Mobo: MSI B250 Bazooka Plus
OS: Windows 10 Pro 64-bit 1909v

 

[Phaaze88]

I believe it has to do with the Corsair VS550 not being 'Haswell Ready'. This applies to all Intel cpus from Haswell(4th gen) and later:
"When an Intel Core (i3, i5, i7) processor is idle, it goes into a sleep state that requires less power than when the CPU is active. Since the motherboard voltage regulation modules that provide power to the CPU gets their power from the power supply's +12V rail, these sleep states can dramatically reduce the load on the power supply's +12V rail.

According to Intel's presentation at IDF, the new Haswell processors enter a sleep state called C7 that can drop processor power usage as low as 0.05A. Even if the sleeping CPU is the only load on the +12V rail, most power supplies can handle a load this low. The potential problem comes up when there is still a substantial load on the power supply's non-primary rails (the +3.3V and +5V). If the load on these non-primary rails are above a certain threshold (which varies by PSU), the +12V can go out of spec (voltages greater than +12.6V). If the +12V is out of spec when the motherboard comes out of the sleep state, the PSU's protection may prevent the PSU from running and will cause the power supply to "latch off". This will require the user to cycle the power on their power supply using the power switch on the back of the unit."

Disabling the C6 and C7 sleep states in the bios should stop this.