Question PC restarts every 5ish seconds infinitely


Mar 28, 2015
After casually playing some games this afternoon, I was happily greeted by a blue screen that said "your PC needs to restart" or something along those lines, I can't remember exactly what it said. I naturally waited a few minutes for it to restart, but it did not, so I hard reset it hoping that I didn't just ruin it. After the screen went black, I waited a few seconds, then turned it back on. I was confused to see that noting happened, so I looked at the LED's inside my computer to see if it was even runnning. I saw that the lights would turn on for a second, then back off... over and over and over again. The fans would spin, the lights would turn on, and my keyboard and mouse would briefly light up, then it went dark. Between each reset, the lights would be off for a few seconds, then come back on.
After a bit of googling, I read that it could possibly be a PSU issue, so I went and bought a new Corsair 750w fully modular one. I did not do much digging for the issue after reading that it could be a power supply failure for a couple reasons.
  1. I was anxious to fix my computer because I have an assignment due tonight
  2. I have replaced everything in my PC from the original build except the PSU, so I was inclined to make the upgrade.
I got home, stripped out the old psu, and carefully installed the new one over the course of a couple hours of monotonous cable management. I prayed that it would magically boot up with no issues, but naturally it did not. The same issue as before is still there.
Now, I am desperate to fix it in order to be able to complete my assignments and to get ready for the new COD release. Please, if anyone has had this issue in the past, or knows any information to help me out, please let me know what you know. Also, feel free to ask me questions to learn more about my issue. My specs are as follows.
CPU- Intel I7 9700k
MOBO- MSI MPG Z390 Gaming Plus
RAM- Corsair DDR4 2x8gb
Thanks to anyone that helps!


Try doing a hard reset of the BIOS first after double checking that the display cables have not come loose at either end.

BIOS Hard Reset procedure

Power off the unit, switch the PSU off and unplug the PSU cord from either the wall or the power supply.

Remove the motherboard CMOS battery for five minutes. In some cases it may be necessary to remove the graphics card to access the CMOS battery.

During that five minutes, press the power button on the case for 30 seconds. After the five minutes is up, reinstall the CMOS battery making sure to insert it with the correct side up just as it came out.

If you had to remove the graphics card you can now reinstall it, but remember to reconnect your power cables if there were any attached to it as well as your display cable.

Now, plug the power supply cable back in, switch the PSU back on and power up the system. It should display the POST screen and the options to enter CMOS/BIOS setup. Enter the bios setup program and reconfigure the boot settings for either the Windows boot manager or for legacy systems, the drive your OS is installed on if necessary.

Save settings and exit. If the system will POST and boot then you can move forward from there including going back into the bios and configuring any other custom settings you may need to configure such as Memory XMP profile settings, custom fan profile settings or other specific settings you may have previously had configured that were wiped out by resetting the CMOS.

In some cases it may be necessary when you go into the BIOS after a reset, to load the Optimal default or Default values and then save settings, to actually get the hardware tables to reset in the boot manager.

It is probably also worth mentioning that for anything that might require an attempt to DO a hard reset in the first place, it is a GOOD IDEA to try a different type of display as many systems will not work properly for some reason with displayport configurations. It is worth trying HDMI if you are having no display or lack of visual ability to enter the BIOS, or no signal messages.