Khadgar42: It's an Lenovo Ideapad Y510,
and I've tried to switch the booting order in the BIOS without success.
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Wait a minute...
there is this button next to the power plug.
Oohkay, so now I can restore factory settings but I will lose my data. Mphh... No repair mode, sadly
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Magnitus: Contact support and ask for a recovery disk(s).
Got a 530W Thinkpad last year, created the recovery backup on a bad medium and it wouldn't let me create another recovery medium.
I contacted support and they shipped me a bunch of recovery disks without charges (mind you, it was for a premium laptop and the warranty wasn't expired).
My gf's old laptop was an aging HP, the warranty was expired and she had no recovery disk. I contacted support and they sent me the recovery disks for like 30$.
Usually, companies are pretty cool about sending you recovery disks for their laptops and won't charge you an arm and a leg for it. It's just good support and an essential strategy for repeat business.
PS: If you need to recover files before formating, they're a way to start Windows on the command prompt if you finickle a bit at boot time.
From there, you can copy/paste your files on a recovery medium (ex: USB stick) and if you really suck at the command prompt (and can't be bothered to google it), you can open up notepad (just type "notepad") and use notepad's open/save menu to copy your files (yeah, Windows is way too permissive with what it lets you do with its open/save menu).
That reminds me, I need to do that as well, the recovery disc creation utility failed to mention that you have to take at least one back up in order to restore the original files to the disk. Seems to me that creating the original disk should include all the files necessary to do a factory reinstall. Which was especially annoying because my laptop didn't have a disc drive of any sort other than the SD card slot.