"Reboot and select proper boot device."

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ahura999

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Mar 31, 2017
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My friend helped me build a pc in September 2015. If I don't use the pc for about 24 hours and I turn it back on, a screen shows up stating to "reboot and select proper boot device". I'll then have to push the power button and shut it down. When I'll boot it up again, it will boot windows properly. Why does this happen and anything I can do to fix it? This ONLY occurs after about a day of no use in-between boots. If i boot the PC on a day and shut it down, and boot it about 10 hours later, it will boot properly. If i wait about 24 hours in-between, it seems to not identify the ssd from which i boot from (SSD is not shown in list of available hard drives to boot from). I have replaced the cmos battery, checked all the hard drives in my PC if they're properly connected, and switched SATA cables as well but nothing works. At last, I ordered the same exact SSD model (but 1tb instead of the 500gb i have right now) to see if it's a faulty drive that's causing this and I'll be sure to update on this thread, but are there any other possible fixes?

Bios: 2.6
Board: Z97-G45
VGA: EVGA GeForce GTX 980 Ti 6GB SC+ GAMING ACX 2.0+
PSU: EVGA SuperNOVA GS 220-GS-0650-V1 80 PLUS GOLD 650 W ECO Mode Fully Modular NVIDIA SLI Ready and Crossfire Support Super Silent Continuous Power Supply
CPU: Intel® Core™ i7-4790K
MEM: HyperX Fury Red Series 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model HX316C10FRK2/16
SSD: PNY XLR8 480GB CS2111 Internal 2.5 inch SATA III Solid State Drive with 560 MB/s read speed (SSD7CS2111-480-RB)
HDD: Seagate Desktop HDD ST3000DM001 3TB 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
COOLER: Corsair Hydro Series H100i GTX
OS: Windows 10 64bit Professional
 
Solution
E
Your spec is wrong - Z97 motherboard can not have Core i7-6700K CPU. Which one of these are correct?

What happens when you connect the same drive into another SATA port with a different SATA data and SATA power cable ?

If cables are OK and you get this error again, one of the two things might be happening:
* your Windows bootloader/EFI partition may be damaged and you might need to do a Startup Repair

* your BIOS settings are set to use either 'Other OS' - meaning look for all possible OS on all possible disks before boot including any USB flash disks etc; or Windows X / Windows X WHQL is selected but CSM mode is set to be active - meaning the system will try to boot both UEFI and non-UEFI windows OS.

Even if there is a single...
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eyupo92

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Aug 23, 2010
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Your spec is wrong - Z97 motherboard can not have Core i7-6700K CPU. Which one of these are correct?

What happens when you connect the same drive into another SATA port with a different SATA data and SATA power cable ?

If cables are OK and you get this error again, one of the two things might be happening:
* your Windows bootloader/EFI partition may be damaged and you might need to do a Startup Repair

* your BIOS settings are set to use either 'Other OS' - meaning look for all possible OS on all possible disks before boot including any USB flash disks etc; or Windows X / Windows X WHQL is selected but CSM mode is set to be active - meaning the system will try to boot both UEFI and non-UEFI windows OS.

Even if there is a single disk, depending on these settings the same disk may be listed twice on boot options - one with header UEFI, other without header. On successful boot, your computer must boot from the option marked as 'UEFI Windows Boot..'

Now, looks like your computer is set to boot from non-uefi one as first boot option. After first try, bios recognizes the need to try the second option and boots from there successfully.

As for 24 hour etc... Most probably your computer is not shut down completely but enters a deep sleep state ( nowadays they all do on newer Windows OS ) so power is not completely cut and computer keeps a few things in memory like where to boot from for faster booting. After some time, computer gives up on waiting and powers down completely. So after 24 hours, it loses this memory of which boot option was successfully used last time and tries to boot from first boot option again - which is the non-uefi one.

So, adding these two things together : make sure your first boot option is correct - set to boot from 'UEFI Windows Boot...'.

If you do not plan to boot from non-uefi things like booting some non-uefi boot tools, disable CSM and/or set OS option to Windows. If required, disable all other items from boot options by disabling all options except first one.

I have seen cases where the same disk was listed 10+ times on the boot option list - so BIOS getting confused happens sometimes.

Hope these help.
 
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