For those Roku models that have SD card slots, a corrupted card can prevent the Roku from advancing beyond the startup screen when powering up. Try removing the SD card and restarting.
You may be able to salvage the card. Try formatting the card in your computer, if it has a card reader that can handle SD cards. After formatting, see if the Roku will detect and reformat the card successfully.
Also, see if this post helps: https://community.roku.com/t5/Remotes-Accessories/Added-SD-Card-Remote-no-longer-works/m-p/646676#M1...
Windows instructions, don't know what would differ on other systems:
Do a slow (i.e. not "fast") format of the card via your computer. Select FAT32 and select it to use the default allocation size.
[Back when I had a Roku 3, after the 2nd or 3rd time the card got corrupted, I just decided it wasn't worth the hassle and left it out.]
Roku Community Streaming Expert
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X
