[SOLVED] PC lacks power, PSU or Mobo ?

[MLLapan1]

Hi.
Month ago I remember I had problem after turning on my PC, HDMI show nothing on my monitor. I switch monitor for TV and it started working, I switch back to monitor, it was working so I ignored.

Last night, I noticed my PC becoming slow, so I decided to reinstall OS, so I made bootable GPT with Rufus, and it was error to boot from it due UEFI legacy.
I have AsRock H310CM-DVS, so there is option CSM to disable it or change all 3 options to UEFI.
Disabling it would not recognize my USB disk, so I put it all on UEFI.
I installed OS, finished all, and needed one more restart, and boom, black screen, no power in mouse nor keyboard, I tried hard restart many times.
What worked was reseating CMOS, I hit F1 afterwards and logged in OS again.
Then I went back in BIOS, and again changed all 3 options to UEFI, restarted, mouse and keyboard had power, but nothing in monitor, this is why I mentioned that happened similar month ago.

I restarted manually, and PC works again, still all 3 options on UEFI.
I stressed with Prime and Furmark.
Was reseating and trying one than another memory stick in time it wasnt giving power to keyboard, mouse or signal to monitor, it did not helped until CMOS was reseated.

I do not think it has anything to do with this MBR to UEFI change, but just happens at this time, if I am wrong correct me.

By my thinking, I have two possibilities, PSU or MOBO.
By all this i write, what is your thinking which one is guilty.

Lets say it randomly loses power to some components, and that would say PSU does not have power to run all, and first what always goes down is GPU, because it needs most power right?

The real question is, why reseating CMOS helped, does that tell us something about which part to blame, does that tells its MOBO and not PSU fault?

I also hear noisy fan on case grummming on some power ups, and i have to restart so it calms down.

PXE opRom was only thing i changed to UEFI only.

 

[mc_spaceman]

A simple conversion from MBR to GPT isn't enough to make your OS disk bootable in UEFI mode. As for creating a path to Bootx64.efi, you can't just type that and expect it to work. The Bootx64.efi file you're pointing to has to actually exist on your disk, specifically residing in an actual ESP (EFI System Partition). That is created by default when you install Windows in UEFI mode in the first place, it would NOT have been created on a disk originally set up for Legacy BIOS booting, nor would a simple GPT conversion have created it. And since Legacy BIOS mode doesn't support booting from GPT disks and you can't convert a GPT disk back to MBR, you're basically stuck. In theory you might be able to manually create an ESP on your GPT disk and get the necessary bootloader files copied onto it, but I'm not sure that would work, and it would almost certainly be impractical to try to help you to do that over an Internet forum. For one thing, Microsoft's guidelines specify that an ESP has to be located before the OS partition, not after it, which is harder to achieve when you have existing partitions on disk.

At this point I would probably recommend that you again download and mount your Windows 10 installation media, and re-install again. At the step in the wizard asking you where to install Windows, delete ALL partitions on your internal disk until it shows as just a single "Unallocated space" entry, then choose to install there. Windows will set itself up properly for UEFI booting upfront in that case, including creating the appropriate partitions.

you can also try to do the following;

if you can manage to get to dos prompt/command shell in an elevated platform ( run as administrator)

• Boot the computer using the Windows 7/8/8.1/10/11 installation media.
• On the first screen, press SHIFT+F10 to bring up the command prompt.
• Run the following commands at the command prompt.

diskpart
list disk
select disk # Note: Select the disk where you want to add the EFI System partition.
list partition
select partition # Note: Select the Windows OS partition (# number) or your data partition.
shrink desired=100
create partition efi size=100
format quick fs=fat32
assign letter=s
list partition
list volume Note: Note the volume letter where the Windows OS is installed.
exit

bcdboot X:\windows /s S:
Note: Replace "X" with the volume letter of the Windows OS partition.

BCDBoot copies the boot files from the Windows partition to the EFI System partition and creates the BCD store in the same partition.

Remove the Windows installation media and restart the computer into your BIOS settings and set the SSD as the First Boot Device.