I had the following ready for you in case you needed it... but based on what I've read following my last post yesterday I'd agree with Acer support. It sounds like the HD has failed. BUT I find it odd that you can't get into BIOS or get a repair type boot started with the drive bad. Of course some of those restore files are on the HD so there's that... but you should still be able to get into the BIOS and change the boot order. That you've had to remove peripherals in the past to get the system to boot isn't too encouraging either. That makes me think the MB could have issues - but it could be something simple as the BIOS not liking one or more of the peripherals. For several years Dell had a BIOS that wouldn't boot properly if a USB printer was attached. Yeah... that took some time to determine and I had a "private" user's computer at my house for "repairs" several times before that was determined to be the cause. It'd work at my house and at her house when I put it back in place. She'd connect the printer after I'd left and it'd run for a few weeks before something would cause/need a reboot and *bam* no POST or startup. I'd pick it up, check it out, etc. and finally had the issue hit us at work and the light went on. Anyway... here's that post I'd prepared earlier. If you can get the USB to boot you can do a disk check from it and possibly get a repair going - but it does sound like your HD has gone tits up. If a system restore doesn't fix your issue you may need to do a "startup repair" - here are the steps for that, which includes getting new installation file - a help as you mentioned you don't know where yours is: You may use Windows 10 installation disc/USB to perform Startup repair by creating a Media Creation Tool. Use the link below to create the media tool. Refer: Windows 10 ISO Download Note: Before performing the Startup repair please go through the above link and follow the steps. Perform the Startup repair: When your computer starts, wait for the manufacturer logo to check the option for boot menu, it will usually be F12. The boot menu key might differ with each manufacturer. If you are unable to find the boot menu key, you may refer the user manual. Restart the computer, when the manufacturer's logo is displayed, keep pressing the Boot menu option key to enter the boot menu and change the boot option to CD\DVD ROM. After you boot your computer using Windows 10 DVD or System Repair Disc, a black screen appears with gray text "Press any key to boot from CD or DVD". Press any key. Select the correct time and Keyboard type. Click Repair your computer in the lower left corner Click on Troubleshooting, advanced option and then click Startup repair.