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Let me say first I am pretty experienced and have tried various diagnostics before posting. I have never seen this combination of seeming contradictory diagnostics while getting no error messages. My wife’s Dell XPS 13 laptop with Windows 10 Home stopped booting after Dell Support Assistant pushed a bios and drivers update last week. After accepting the updates, there was a period of downloading, a bunch of “done” boxes, and a prompt to finish and restart. My wife hit restart and the laptop seemed to be running normally. She doesn’t remember if she had to log on again or not. At this point, I did a full disk image backup. (Question whether I backed up the new but not yet apparent problem or not.) Then I closed the lid, which normally puts the laptop in Sleep mode. When she opened the lid, the power light came on but the screen was blank. No error messages at all. No “boot failure”, etc. I used the power switch to force shutdown then to start up again. Nothing happened. All startup and shutdown has to be done by the power switch. Sometimes on startup there is a Dell logo, a circle of stars, and then a blank screen. Other times just a blank screen. There is never a Dell logo on opening the lid, though the power light usually comes back on. There are no error messages on starting up. If I get the Dell logo on starting with the power switch, I can use F2 for bios info. Bios version 1.6.1, though I don’t know if that is pre or post update. The F2 bios information shows the correct hard drive info, but that may just be stored and not a rescan. I don’t know. Bootrec /scanos says there are no Windows installations. I can sometimes use F12 for diagnostics. I can also get into Advanced Recovery Options by holding the power button for 20+ seconds, again only sometimes. All the Dell hardware diagnostics say “passed.” Dell’s Startup Repair says there is an error, but “Startup Repair couldn’t repair your PC. “ I can boot from a USB containing Windows PE. This is a recovery USB created by Macrium Reflect, a backup program. However, it does not see any hard drive at all. From the Advanced Recovery Options screen (20+ second hold down of the power switch), I can get to a administrator command prompt after entering my Windows password. There I can see my two main partitions plus three hidden Dell partitions. A DIR shows all my Windows and program files on C: and all my data files on the fourth partition, which shows in this window as E: but in Windows as D:. I can do file operations, like copy a file from the hard drive to a USB stick. QUESTIONS: Does anyone have an idea what might be happening? Would some utility to fix the boot sector work without doing further and irreparable damage? Anomalies: 1. Boot from Win PE USB stick sees no hard drive at all. Command prompt from Advanced Recovery asks for my Windows password and sees all five partitions ordered C,D,E,F,G, where E is what Windows shows as D:/ 2. Sometimes after a power switch forced shutdown, the machine will come back on when the lid is later reopened. Makes me wonder if there is some unintended move into a hibernate state. I disabled hibernate right when my wife got the laptop 15 months ago. That also made me wonder if the machine got stuck somewhere while restarting itself after the bios/drivers update. That is, maybe it didn’t actually restart on pressing the restart box, but just returned to a regular running state without actually updating. Then closing the lid actually started the updates installing, and hung the machine. Incidentally, I have talked to several Dell support people who were not helpful. All they could say was “needs a new motherboard.” Since the laptop came from Costco, their tech people also support it. Their idea was a factory re-image of the hard drive. I have to think there is a simpler solution that will not cause all the work of re-setting up programs and data. Also, it may be a bios corruption from an update, which disk re-imaging would not fix. ---------------------------------------------------------------------- Here are my notes of things tried. I did this yesterday and repeated it today while taking better notes. I have summarized the highlights above. F2 for bios info Boot: UEFI THNSNS512GPUK BVNe Toshiba 512Gb Par SATA config - Raid On checked. Not checked: AHCI Drives: SATA-2 and M.2 PICe SSD-0 both checked Secure boot: was enabled, I disabled it for testing No events in logs except on and off F12 after exiting F2 screens (this is a character only screen) Boot mode is set to: UEFI; Secure Boot: OFF Device config: Physical disk info Port: 1.0 Model THNSNS512GPUK NVMe Toshiba 512GB Status Non-RAID Diagnostics: ePSA Pre-boot System Assessment (4304.07) “No problems detected with this system” Did not do extended memory tests - 38 minutes Exit diagnostics and restart: just blank screen Force shutdown with power button, then restart gets Dell and back to F12 Try Windows boot manager choice Get Dell logo, circle of dots, then just blank screen Force shutdown with power button. Restart first gets blank screen, then force shutdown and restart again gets Dell logo. F12 and boot to USB Macrium Reflect Browse “this PC” only shows the Recovery drives created by the USB boot, not any actual disk partitions Search drives for Windows operating systems shows none Exit gets Dell logo, circle of dots, then blank screen Hold power button 30 seconds Get Dell logo and “Please wait”, then blue Recovery Select Advanced Recovery Options Troubleshoot, then Advance options Command Prompt Choose account to continue Logon to my account; enter password Window titled: Administrator: X:\Windows\system32\cmd.exe In cmd box, “not enough memory resources are available to process this command” Change to C: Dir looks normal for C: partition. Change to D: It has no files, 489 Gb free. Says “Recovery.txt” Change to E: Looks correct for D: partition folders. Just one file showing. Not sure if there were individual files in D: root. 199 Gb free. CD Data folder; looks correct, with subfolders and individual files Change to F: recovery Volume is WINRETOOLS; 456 Gb free Startup Repair Startup Repair couldn’t repair your PC.