HP Compaq 8200 Elite Small Form Factor computer does not display an image after resetting the BIOS

[rasebor]

Greetings! I bought an HP Compaq 8200 Elite Small Form Factor computer. I serviced it, and decided to reset the BIOS immediately. I did it like on a regular PC: I took out the battery, and after 10 minutes I put it back in.
The computer started up by itself immediately after being connected to the network. But it didn't display the image. I turned it off several times with a button. It didn't help. Unplugging it from the wall outlet didn't help either
Please tell me what could be the cause, and how to fix it?

[Paul_Tikkanen]

Hi:

That isn't how you reset the BIOS in the 8200 Elite PC model series.

There is a little yellow clear CMOS button on the motherboard near the battery you press and hold for 

See the service manual, Appendix E, pages 304 & 305 for how to clear the CMOS.

Maintenance and Service Guide 8200 Elite Series Convertible Minitower 8200 Elite Series Microtower 8...

Unfortunately, I wouldn't be able to help you with a problem like that because removing and replacing the battery should not have caused any issues.

Something else is probably wrong with the way you 'serviced' the PC.

Check your work over again...cables, internal wires and connectors, etc.

[rasebor]

Thanks!

All I did was what was necessary: I replaced the battery, changed the thermal paste (I didn't pull out the processor). I did not remove the connectors. Although I do not know what condition the PC was in before me. Unfortunately, I didn't turn it on immediately upon purchase.

Thanks for the link! Unfortunately, I don't speak English. Please give me a quote from the document. I'll find it by searching, and I'll translate everything I need.

[Paul_Tikkanen · Accepted solution]

You're very welcome.

Here is a copy and paste of pages 304 & 305 of the service manual:

Clearing and Resetting the CMOS

The computer’s configuration memory (CMOS) stores information about the computer’s configuration.
The CMOS button resets CMOS but does not clear the power-on and setup passwords.

Clearing CMOS will clear the Active Management Technology (AMT) settings in the Management
Engine BIOS Extension (MEBx), including the password. The password will default to “admin” and will
need to be reset.

The AMT settings will also need to be reset. To access the MEBx, press Ctrl+P
during POST.

Turn off the computer and any external devices, and disconnect the power cord from the power
outlet.

Disconnect the keyboard, monitor, and any other external equipment connected to the computer.

WARNING! To reduce the risk of personal injury from electrical shock and/or hot surfaces, be
sure to disconnect the power cord from the wall outlet, and allow the internal system
components to cool before touching.

CAUTION: When the computer is plugged in, the power supply always has voltage applied to
the system board even when the unit is turned off. Failure to disconnect the power cord can
result in damage to the system.

Static electricity can damage the electronic components of the computer or optional equipment.
Before beginning these procedures, ensure that you are discharged of static electricity by briefly
touching a grounded metal object. See the Safety & Regulatory Information guide for more
information.

Remove the computer cover or access panel.

CAUTION: Pushing the CMOS button will reset CMOS values to factory defaults. It is
important to back up the computer CMOS settings before resetting them in case they are
needed later. Back up is easily done through Computer Setup. See Computer Setup (F10) Utility
on page 4 for information on backing up the CMOS settings

Locate, press, and hold the CMOS button in for five seconds.

NOTE: Make sure you have disconnected the AC power cord from the wall outlet. The CMOS
button will not clear CMOS if the power cord is connected.

Figure E-1 CMOS button

NOTE: For assistance locating the CMOS button and other system board components, see the
Illustrated Parts & Service Map (IPSM).

Replace the computer cover or access panel.

Reconnect the external devices.

Plug in the computer and turn on power.

NOTE: You will receive POST error messages after clearing CMOS and rebooting advising
you that configuration changes have occurred.

Use Computer Setup to reset any special system setups along with the date and time.

[rasebor]

Thanks for the snippet! Translated it. I'll do what it says.

[Paul_Tikkanen]

You're very welcome. 

Good luck!