Clear CMOS settings in HP OEM IPISB-CH Cleveland 623914-003

[xscess]

After disabling 3 entries of "Windows boot manager" under UEFI in BIOS, now all i get is blank or black screen. Monitor doesn't even come out of power saving mode and keyboard caps lock / numeric lock lights are not coming up either.

As you can see i'm by no mean expert on motherboards, but i believe, this "HP OEM IPISB-CH Cleveland Pegatron", manufactured in mid-2011, do not have a full fledged UEFI, which I have found on many recent HP model. Where you could disable UEFI altogether. In this model, the only way you could do it is under "Boot order" menu.

So far I have tried different monitors, disconnected hard drives, removed memory modules, graphics card, CMOS battery, main power connector from motherboard, etc. few times...

The biggest issue i'm having is, how to clear CMOS settings. Here's the HP page support for IPISB-CH Cleveland:

http://support.hp.com/us-en/product...ries/5035344/model/5060998/document/c02668523

Under "Clearing the CMOS settings", there's a picture on how to change the jumper in order to clear settings but...

(1) there are two jumpers by default(which is shown in HP's and all other images of the motherboard elsewhere... while "how-to clear" pic displays only one ??

(2) there is no numbering (1 to 6) on the actual motherboard, but i think, i have tried all the combinations, with and without CMOS battery in place.

Actual photographs:

Few other things, i have played around with jumpers only after removing power cord, and then pressing the power-on button on the PC to drain power. HP tech support said the same thing as shown in "Clearing the CMOS settings".

Thanks a million in advance, any help is greatly appreciated.

 

[Burpo]

You will need to move 1 of the jumpers to the adjacent pin temporarily.

"Clearing the CMOS settings
CAUTION: Do not change any jumper setting while the computer is on. Damage to the motherboard can result.
This motherboard has a jumper to clear the Real Time Clock (RTC) RAM in CMOS.
Turn OFF the computer and unplug the power cord.
Move the jumper to clear for 5 to 10 secs, then move the jumper back to default.
Plug the power cord and turn ON the computer.
On the next startup, enter BIOS setup to re-enter user settings."

 

[VirtualLarry]

OP, you screwed up, deleting all of the UEFI boot options. Unlike MBR boot, where the BIOS simply looks for a valid bootsector on the drives in the order listed in the BIOS, with UEFI, the bootable OS actually registers itself with the UEFI during the install phase. You need to repair the install somehow, to re-register your OS bootfiles with the UEFI.

This was hinted at in some of the threads in the OS forum, involving cloning UEFI systems, and not having them bootable, unless they were registered in the UEFI for booting.

Note that my Foxconn NanoPCs, with UEFI OS installers, install (register) an OS boot option, by name, into the UEFI. The UEFI doesn't simply show the device name.

Some motherboards are more traditional. My Gigabyte GA-H81M-DS2V board, will list the bootable device twice, once with UEFI in the name, and one without. My ASRock 990FX board does the same.

 

[xscess]

@ Burpo and @VirtualLarry

Many thanks for the replies.

You will need to move 1 of the jumpers to the adjacent pin temporarily.

That i have tried countless times even before the original post, and after, to no avail.

OP, you screwed up, deleting all of the UEFI boot options.

I just disabled UEFI options, which you couldn't delete anyway, only enable or disable.

My understanding was, once all UEFI entries are disabled, it will boot from legacy boot options like, boot from Live-Linux USB drive.

Also, i was under impression that, even with no hard drive connected at all, UEFI or legacy BIOS will let you log into setup, and change the settings.

Anyone else have an idea on what could be tried next... or the motherboard replacement is the only option left ?

 

[LittleJohnu]

Hi,

yesterday I have observed same problem. After disabling all UEFI boot entries (to be able do legacy boot as default). PC look likes dead. No video output. I have no tried reset cmos as is written on hp support page. But no luck.

Please if you fix this problem meantime, give me advice.

Thanks

 

[coolsurf6]

Well i recently tried deleting the password by removing the battery and with the jumpers. when ever i put it back to the 'default' position, my computer does not start until i put it back in the clear. I tried changing graphic cards but it seems like it didnt work so when i went back to the original one it is now doing the ChkDsk and i cant stop it nor go into safe mode since it requires the BIOS password. I have the exact same motherboard as in the pictures. I spent about 5-6 hours waiting for the file check to finish and it ever did.

EDIT: Just wanted to add that it changed the time back to 01/01/2005 and the password is still there. There is no backdoor password that i know of.