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Dell Optiplex 755 hardware problems

Posted on 2016-09-07
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Last Modified: 2016-11-22
Hey guys when i trun on my Dell 755 optiplex it show the dell mono and key board doesnt work i cant go into bios and then it shows the message..  No device found
                     Achi bios not installed..
So what should i do now...?
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Question by:wolve rine
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by:John Hurst
John Hurst earned 320 total points (awarded by participants)
ID: 41788137
Get a bootable CD (Ultimate Boot CD or Knoppix). Try to start with this.  Does this work?

Is there no BIOS except for that message.

If so, there is a hardware problem and you need to get the machine serviced.
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by:SStory
SStory earned 320 total points (awarded by participants)
ID: 41788138
Can you use a USB keyboard in the back? Different keyboard?
I'd try to solve the keyboard issue first and the rest may go away. If you can't get a keyboard working and can't get into BIOS that will be difficult.

John Hurst has a great suggestion.  Booting from another OS.  Between that and trying different USB ports and keyboards there isn't much else to do.  I've seen the front panel go bad on many of the 745/755 models, but usually the power won't come on in that case.
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by:rindi
rindi earned 320 total points (awarded by participants)
ID: 41788170
Remove the CMOS battery and replace it with a new one.
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by:noxcho
noxcho earned 320 total points (awarded by participants)
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First thing to try is a suggested by rindi - CMOS battery. If the error is really generated by BIOS as you say then the motherboard is not ok. Is the PC under the warranty yet?
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by:rindi
rindi earned 320 total points (awarded by participants)
ID: 41788305
Very unlikely. This model is pretty old with core2duo CPU and probably came with Vista originally. I just got one 2nd hand recently for 11.-- Swiss Francs, and it works fine.
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dbrunton earned 400 total points (awarded by participants)
ID: 41788598
Disconnect hard disk and try a bootable CD such as the UBCD as suggested by John Hurst.

UBCD obtainable from http://www.ultimatebootcd.com/ (if you need help obtaining or creating then ask)

See if the UBCD will boot and report back.

I suspect you've got a bad hard disk from the message "No device found"

The message "AHCI BIOS not installed!" may be normal according to https://www.ephotozine.com/forums/topic/dell-pc-crashed----ahci-bios-not-installed-64778 and that site suggests various fixes.  But again I suspect a bad hard disk.
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by:SStory
ID: 41788677
dbrunton, I expect hard drive possibly as well. I also wonder is this a RAID situation or just a normal drive?
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by:dbrunton
ID: 41788744
Don't know.  Could be either.
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by:nobus
nobus earned 320 total points (awarded by participants)
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wolverine - post a picture of the screen you get

here is how i handle unbootable systems :
http://www.experts-exchange.com/Hardware/Components/Motherboards/A_1945.html                  (Short-overview-of-how-to-troubleshoot-bad-hardware-when-a-pc-does-not-post)
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by:dbrunton
ID: 41821337
Good variety of suggestions on way to solve this problem, including battery replacement, keyboard replacement, test with bootable CD, various fixes for BIOS error message, hard disk failure and general troubleshooting.
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