How to reset BIOS for hp omni 120-1124 desktop

see if this link helps you out... How do you reset an HP omni 100 PC Google Search

Try starting in safe mode. Then administrator account. After that go into the control panel and remove the passwrod on your account.

Just a guess I think ur cpu is overheating turn on pc and press whatever key it says on screen to enter setup wen you have done tht look for pc health option and check to see if cpu is getting hotter it should be stable between 30-50 degrees it will shut down automatically in 90 degrees or above if it is doing that you prbbly need more thermal paste between cpu fan and cpu underneath the fan be care full not to spill any into the cpu thts the brain of the computer go to youtube to see how to do this there might be a few videos on it if you feel you don't want to risk doing it yourself bring it to repair shop... Hope this helps

hp.com
RTM ,read the manual or ask on their forum.

that is hacking
google how to hack bios passwords this exact PC

No problem click on Start...wait what form of Windows do you have?

vipu start your own post, no hyjacked
use only YOUR facts, not others.

first tell what not turned on means.
if dead silent and no screen text or graphics ever.
do a long reset first.
the pC can lock up in sleep mode, and the long reset cures that.
its cause by bad drivers.
or upgrading to w10 the wrong WAY.

a desk top PC?, what is it? use full names of things.
you never said what the screed did, is it black all the time.
if yes, does BIOS screens work?
F11 key, (the magic key) on older HP its F10 older still (none)
what year PC is this, full model number , type it out full off the service tag.... i cant guess omni this is. there are 29 models and subs.

The newer HP systems, all have this F11 key
this is the magic key as you boot, you hit it fast (tap tap tap)
and it goes in to recover mode. My 2006 Laptop does.
the HDD if still working and corrupted,
will run the virtual installer disk, via a hidden partition on said HDD>
if that is confusing, try to imagine 3 ways to install.

F11
HP recover disk called the media kit. (uses on replace HDD )
MS disks, wrong, and will fail., ask how if must,,,,


if you and gone to HP forum or the support page
you'd have seen there is may different omin100s, lots
sorry cant guess yours...


you asked for help and cant muster up the service tag words
full model at least.

if you had id have pointed to the page that tells you what to do step by step, at HP.com
even what to do when it dont boot,all ways from SUNDAY.
the oldest one supported is 2010 year.
here is 100-5000 omni ,series, many in series.

https://support.hp.com/us-en/product/hp-omni-100-5000-desktop-pc-series/4273707/troubleshooting


and last
no start actual pages... i see it covers most ways, (weak on hardware causes, there are vast cause under that topic, ask)

https://support.hp.com/us-en/product/hp-omni-100-5000-desktop-pc-series/4273707/document/c01884928

Look here...