Stuck in diagnostic boot loop

[Olivejuice]

I have a Dell (Model# TTYFJA00 I think) laptop with a boot issue. The issue is that when the machine is cold booted or restarted, it boots into Dell's "ePSA Pre-Boot System Assessment (4302.10)" BIOS diagnostic utility. Letting this utility run never finds any issues or errors. If i hold F12 during boot and manually boot to the drive, Windows 10 boots as normal.

 

Here's what I have tried thus far:

 

- Letting the diagnostic utility run its course (never finds anything wrong)

- Switching startup method in windows to 'normal'

- Re-seated power button ribbon cable (I read somewhere that non-keyboard button presses can cause the diagnostic to come up)

- Reinstalled windows 10

- Disabled/Enabled secure boot (I read on a Dell forum that sometimes secure boot doesn't play nice after a windows update)

- Verified the partition in which windows is installed is marked as 'active'

- Reseated drive and RAM

- Reset BIOS to default settings

- Updated BIOS to most recent version

- Setting the hard disk as the only boot option
- Swapped the HHD for a known good SSD with windows 10 installed

- Verified CPU fans are spinning

- Tested with compatible charger

- Tested with/wthout battery installed

 

 

Would love any and all reccomendations you can provide, I'm getting really frustrated with this...