[NAME] I had hoped to repport that the steps to recover the BIOS and get back to a usable computer worked but sadly not yet. The steps with the .rcv file on a USB drive inserted into a port, turning on the PC and hitting CTRL-ESC worked - I got the BIOS recovery menu and successfully recovered the BIOS, according to the final screen in the process (photo). [IMAGE] And so the system restarted, four or five times, starting with a screen saying Windows updates in progress - I guess a literal continuation of what was happeneing with Windows Update right before the BIOS corruption a few days ago. After another restart, the Dell logo appeared with text beneath saying a system update was being installed (photo). No idea what this is. The BIOS? [IMAGE] There was one restart where the Dell logo appeared and underneath was the spinner animation suggesting Windows might load. During all this, the USB drive was still inserted and I could see the flashing light indicating drive activity. I guessed the system was accessing data on the drive although the only file there is the .rcv one. But I eventually stopped the machine (turned it off) as it seemed to be stuck in this position: Dell logo on screen and nothing else going on other than the USB drive being constantly accessed. I have a fundamentral question - should I remove the USB drive after the BIOS flash update succeeds, before the machine actually restarts?  Or does it not matter. And , fyi. all the peripherals usually connected to this PC were unplugged except for the wired keyboard and the HDMI-connected monitor. I need to do this again which is fine as I learn as I go 
This is a new 1 on me. This unit has never given me a minute's worth of trouble in the 3 or 4 years I've had it. Yesterday the standard Windows 11 Pro desktop was up as usual; I left for about an hour and was greeted by a Dell logo on a black screen when I got back. I figured it was just a Windows update that had not quite completed or something but when I rebooted I got the same thing. Since then I've gone through a litany of troubleshooting steps as follows:1. Verified the power supply was good (no beeps or visual error codes and tried it out on another computer also) All the fans spin-up when the power button is pushed and also when the test button on the rear of the actual PSU is pushed. The LED stays green and doesn't flash.2. The power button LED on the front of the computer stays solid white and does not change color nor beep nor flash any error codes.3. Verified that the memory was good (no beeps or visual error codes and tried it out on another computer).4. Changed out the video card for a known good one. Also tried using the integrated HDMI port as well. (Not even the Dell logo appears when I do this, for some reason)5. Changed out the SSD for a couple of known good ones. A different known good one is currently installed.6. The only cables which are attached are the video (HDMI), USB keyboard & mouse ones. No SATA hard drives are attached, either.7. Reset the BIOS via the mobo jumper and also by removing the coin-cell battery and power cord for 10 minutes. Did this 3 different times for good measure8. No POST whatsoever and I can't even access the BIOS setup, either by F2 or F12. It flashes briefly in the lower right-hand corner of the screen and that's it. I've tried moving the USB keyboard & mouse cables to different ports (USB 2 & 3) but to no avail. I've done this more times than I can count.So in summary, this happened quickly, in about an hour's time; prior to this the computer had exhibited no ill symptoms whatsoever in all the time I've owned it. I've had it connected to a functional APC UPS the entire time I've owned it, so it has not been subjected to power spikes, etc. The BIOS had not been flashed anytime recently but the last time it was, no problems were encountered. No error codes, either visual (LEDs) or audible (beeps) have manifested themselves. No new hardware or software has been installed lately. The computer pretty much just has Windows 11 Pro and Office Home & Business 2021 (click-to-run, not Office 365). The CPU is an i7 with 32GB of RAM. To me everything seems to point to a failed motherboard but apparently there aren't any diagnostics (at least that I have access to) to absolutely confirm this. It's more-or-less the "process of elimination" at this point but before I drop a wad of cash on a replacement mobo (probably without a return privilege) I thought I'd see if anybody out there in Dell Land had any other ideas or perhaps have had a similar experience; this is a 1st for me. I'm attaching some pictures, for whatever little it might be worth. Thanks in advance...[IMAGE]Dell Logo On Monitor[IMAGE]Dell XPS 8930 i7 Motherboard[IMAGE]Dell LED On Back Of Power Supply Unit
XPS 8930, possible blown motherboard