Power light pulsing, won't turn on

Hey all,

Got a Deck OLED, & charged it up for a few hours. It turned on & got to the initialization screen, & I powered it off. I took the 2tb SSD out of my old Steam Deck & put it in the new OLED Deck, along with swapping the back plastic with a JSAUX perforated backplate. Both worked perfectly fine with the old LCD Steam Deck.

I am very, very careful when modding devices, & was just as careful with this. After formatting the 2tb SSD & putting it and the backplate on the OLED Deck, the power button light just gently "pulses" for a few seconds, then turns off & nothing happens. Tried holding the power button for 3 seconds, 7 seconds, 16 seconds, 30 seconds, trying to put it in recovery mode by holding volume down & power, but if I hold the power button it will show the pulsing light for a few seconds, turn off, the indicator light will flash solid white once, then cycle between the two over & over. If I connect the Deck to power, the indicator light will stay solid green.

I took the back off, disconnected the battery, & tried plugging the deck into power with the battery disconnected. Instead of green, the indication light stays solid white, & if I press the power button, it just does the "pulse for a few seconds & then stops" thing same as before, but instead goes back to a solid white light.

I tried using the original 1tb SSD the OLED Deck shipped with, no luck. I tried the 512gb drive that was in my old LCD Steam Deck, no luck either. Same as my 2tb Sabrent SSD. It just pulses white when I push the power button no matter what I do.

It worked just fine before, I was insanely careful, just swapping the SSD & backplate couldn't have possibly bricked it. That's insane. Any ideas or thoughts? I really, really, really hate to need to possibly RMA it to Valve, it's gotta be something stupid.

Thanks & sorry for the novel