Question No OS found / Cant get into bios

Thebiz

Honorable
Jan 9, 2014
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Hey folks!

Having a problem with this pc I built for a friend about a year ago. Not quite sure what they did to cause this problem but I can't figure it out.
This pops up when you turn the computer on . "An operating system wasn't found. Try disconnecting any drives that don't contain an operating system."
There seems to be no way to get into the bios as well.

Specs: Mobo Asus ex-b250 , Cpu Intel i5-7600, Psu Corsair Cx-M series Cx550, Ram Corsair Vengeance 16gb (2x8gb), Ssd Adata Su800 128gb, Hdd Seagate BarraCuda St2000dm006 2tb, OS Windows 10

Things I've tried:
  1. Hitting F2 or Delete Key on start up
  2. Disconnected all sata cables
  3. Took CMOS battery out for over a hour
  4. Put in flash drive with bootable Windows 10
Any help would mean a lot thanks .
 

popatim

Titan
Moderator
It's the Del key for the board.
With the system unplugged from the wall & Drives disconnected, short the CLEAR RTC pins for a minute and then start it back up and hold the Del key down.
See if that works. to get into the bios.
 

Thebiz

Honorable
Jan 9, 2014
42
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10,540
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So I swapped the battery for a new one and held down the del key and it came on. It did the Asus splash screen and went into windows. I turned it off to try it again and it won't work now.
 

Thebiz

Honorable
Jan 9, 2014
42
0
10,540
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It's the Del key for the board.
With the system unplugged from the wall & Drives disconnected, short the CLEAR RTC pins for a minute and then start it back up and hold the Del key down.
See if that works. to get into the bios.
I tried to short the CLEAR RTC pins not 100% sure it didn't anything or I did it right. Back at square one .
 

Ralston18

Titan
Moderator
Try the preceeding suggestions.

Then, if no success or intermittent success, power down, unplug, and open the case.

Doublecheck that all cable connections, jumpers, cards, RAM, etc. are all fully and firmly in place.

Intermittent operation is often the result of something coming loose.

Over time due to heat related expansion and contraction system components slowly creep loose.

And connectivity is lost. Does not take much to cause some failure.
 

Thebiz

Honorable
Jan 9, 2014
42
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10,540
1
Try the preceeding suggestions.

Then, if no success or intermittent success, power down, unplug, and open the case.

Doublecheck that all cable connections, jumpers, cards, RAM, etc. are all fully and firmly in place.

Intermittent operation is often the result of something coming loose.

Over time due to heat related expansion and contraction system components slowly creep loose.

And connectivity is lost. Does not take much to cause some failure.
Just triple check all the connections even used new cables no luck .
 

Ralston18

Titan
Moderator
Did you try @jsmithepa's suggestion to configure the BIOS and save the configuration (F10) after installing the new CMOS battery and completing the connection checks?

Starting to think that the PSU could be faulty....

Was it new when installed? Did your friend do a lot of gaming on the pc?
 

Thebiz

Honorable
Jan 9, 2014
42
0
10,540
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Did you try @jsmithepa's suggestion to configure the BIOS and save the configuration (F10) after installing the new CMOS battery and completing the connection checks?

Starting to think that the PSU could be faulty....

Was it new when installed? Did your friend do a lot of gaming on the pc?
I can no longer see the Bios im back to my main problem. After I swapped the cmos battery it booted straight to windows and was working fine. I turned it off to try to go to the bios and it started the "An operating system wasn't found. Try disconnecting any drives that don't contain an operating system." thing again. Everything was new when installed 1 year ago . No gaming on the pc it was just suppose to be a research pc .
 

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