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Question Pc wont boot after installing HDD via sata and booting from it. can´t access bios

Jun 8, 2020
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I'll try to be as detailed as possible, if you need more information i'll try to explain more, this was my first build and i'm new to this world.

My system:

Main drive: SSD M.2 Wd 250Gb Blue M.2 PCIe NVME Fs Color Blue
Secondary drive: Western Digital HDD 1TB Sata 3 6.0Gbs Caviar Blue
RAM: Crucial Ballistix DDR4 8GB 2400Mhz Ballistix Sport LT WHITE
Processor: Intel i5 7400 3.5 GHZ LGA 1151 Kaby Lake
Motherboard: Gigabyte GA-B250M-DS3H LGA
Graphics card: Gigabyte GTX 1060 6GB DDR5 Windforce OC
PSU: Thermaltake Smart 600W 80 Plus White
Tower: AEROCOOL SI-5100 WINDOW
Keyboard: Razer cynosa chroma
Mouse: Razer abyssus


I have the following issue, when i connected an HDD via sata on my PC (which has windows installed) and booting into it after installing and preparing windows during several minutes i was able to navigate through the system of my PC from work and do what i wanted. then i turned off my PC. Until now, everything was going as expected.
Then i wanted to switch back and to boot into my M.2 ssd from the bios, i saved and exit but an error message that i dont remember showed up after booting and then i had to restart. When i wanted to turn on my pc again it says reboot and select proper boot device or insert boot media in selected boot device and press a key.
After that i was never again able to enter bios, despite of it showing the keys combination to enter when i press a key it won't register it and that message appears again.
I think that my mistake was that i should have removed the ssd and the main hard drive before installing the new one.

I already tried to take of the CMOS battery to see if my bios appears when i turn on but nothing happened.

I hope you guys can help me and be able to boot windows from my ssd as usual and its files had not been damaged. Thanks!

PS: ever since i installed my second drive a couple of months ago when i turn on my pc it does 5 beeps but i've ignored it as it used to work jus fine. I don't know if this can relate to my actual problem.
PS2: when i bought the ssd i formated windows from my hdd and unplugged it, then i installed windows on the ssd and plugged the hdd
 
Jun 8, 2020
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After struggling for many hours I finally managed to enter bios by bridging the clr_cmos pins and then my keyboard was dtected, then I changed my ssd to be the first boot option and it worked!
 

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