There are sorts of solutions to fix a Surface Pro that is stuck in the bootup circle, you can recharge the Surface Pro, check the charging cable, turn on the Surface with keyboard shortcuts, disconnect all Surface peripherals, soft reset Surface Pro, force a shutdown and restart Surface Pro, and so forth. If all these ways fail to make your Surface Pro functional, then contact the local repair for professional assistance.
Put the solutions aside first, the priority you have to complete is to grab the files and folders stored on the Surface Pro or further repair might cause data loss. iBoysoft Data Recovery WinPE (ISO) - Trial stands out as the most secure and reliable Surface Pro data recovery utility, always being ready to get your inaccessible files back! You can download it from this page.
For more information, please visit: Surface Pro Won't Turn On? Recover Data from Dead Surface!