New PC won't boot past BIOS

[StormyViper28]

So I finished building my new PC yesterday and after 3 hours of blood, sweat, and tears, I powered it on. I breathed a sigh of relief when it went into BIOS, but that quickly turned to frustration. It powers on, all the fans spin to life, and every component is detected ( I5-12600k, 2x8GB Vengeance LPX 3600mhz CL16, GT 1030, MSI PRO B760M-P DDR4, and 2 drives, my old SATA SAMSUNG 870 EVO 500GB with all my data and Windows install, and a 1TB P3 PLUS from Crucial.), but it won't make it past BIOS. Every time I unplug it, or restart it, it just goes into BIOS and won't post. I've tried removing the new SSD, switching SATA ports, and nothing works. I can't switch BIOS mode to legacy, and it just won't detect the SATA as a boot drive. Please help!

[Wolly9102]

33 minutes ago, StormyViper28 said:

So I finished building my new PC yesterday and after 3 hours of blood, sweat, and tears, I powered it on. I breathed a sigh of relief when it went into BIOS, but that quickly turned to frustration. It powers on, all the fans spin to life, and every component is detected ( I5-12600k, 2x8GB Vengeance LPX 3600mhz CL16, GT 1030, MSI PRO B760M-P DDR4, and 2 drives, my old SATA SAMSUNG 870 EVO 500GB with all my data and Windows install, and a 1TB P3 PLUS from Crucial.), but it won't make it past BIOS. Every time I unplug it, or restart it, it just goes into BIOS and won't post. I've tried removing the new SSD, switching SATA ports, and nothing works. I can't switch BIOS mode to legacy, and it just won't detect the SATA as a boot drive. Please help!

How is your 870 formatted? As MBR or GPT?

[Whatisthis]

Make a usb windows install drive with the windows media creation tool. Reinstall from scratch. Make sure you put windows on your m2 drive.

[Harmsway1283]

5 hours ago, Wolly9102 said:

How is your 870 formatted? As MBR or GPT?

He’s on the right track. I’ve ran into this problem before. You’ll need to convert the drive from MBR to GPT. You can do that in windows if you’ve got access to another computer. Google mbr2gpt.exe and you can find a guide to walk you through it 

[StormyViper28]

10 hours ago, Harmsway1283 said:

He’s on the right track. I’ve ran into this problem before. You’ll need to convert the drive from MBR to GPT. You can do that in windows if you’ve got access to another computer. Google mbr2gpt.exe and you can find a guide to walk you through it 

Thank you so much, I thought just getting a windows flash drive would work as well but I wanted to exhaust my other options first. I don't need to know, but out of curiosity, do you have any idea why it does this?

[Harmsway1283]

10 hours ago, StormyViper28 said:

I don't need to know, but out of curiosity, do you have any idea why it does this?

Since windows 11 doesn’t support legacy MBR, most manufacturers have done away with coding it into the BIOS. It’s one less thing for them to worry about. That’s also why Microsoft added the mbr2gpt.exe to both 10 & 11.

[StormyViper28]

1 hour ago, Harmsway1283 said:

Since windows 11 doesn’t support legacy MBR, most manufacturers have done away with coding it into the BIOS. It’s one less thing for them to worry about. That’s also why Microsoft added the mbr2gpt.exe to both 10 & 11.

That's frustrating but I understand it probably makes a lot of programmers lives easier. I struggled my way through the process of conversion today. I had to repartition the drive and download some iffy software, but it worked! You're my hero tysm! New PC is up and running:)

[Robchil]

it says csm/uefi mode is active.. disable csm and install system fresh on a new nvme.. 

then connect your sata to a port not disabled by m.2 slots..