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How to re-flash a BIOS

By jsilden ·
The machine was working "fine." Added memory. On POST, 1/20th of a second message flashes by - "NVRAM error" and then nothing; so set jumper to reset CMOS. That produces an equally quick message of "CMOS checksum error" -- all this happens during the POST -- no access to diskette, etc has yet occurred. Question is: how to re-flash the CMOS / NVRAM with a last / any known good? Keep in mind, the POST does NOT complete!

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How to re-flash a BIOS

by CG IT In reply to How to re-flash a BIOS

The CMOS checksum error is not unusual after you use the jumper reset. All you have to do is enter the BIOS and reconfigure you table. The NVRAM error is a memory dump after shutdown. In your BIOS/CMOS table, make sure the clear NVRAM on shutdown isdisabled or NO configuration.

To flash your BIOS, you will need to go to your mainboard manufacturer, download their BIOS Flash emergency repair floppy with the latest BIOS. You boot with the floppy and repair the BIOS that way. [not an easy task when your computer is down].

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How to re-flash a BIOS

by CG IT In reply to How to re-flash a BIOS

I want to comment on "Clear CMOS" using the jumper and the problem you have, however to solve your problem, step 1), take out the new memory, step two). make sure you returned the clear CMOS jumper key to original jumper setting. Step 3).boot up andhit the delete key or whatever key the BIOS says to enter the BIOS setup pages. Step 4). resetup your BIOS [there should be a reset to default properties key one uses to reset the BIOS to default settings]. to the default settings for each page. Step 5). Save all BIOS settings and exit the BIOS setup. Step 6.) Do a cold boot.(Turn off your computer then turn back on. Don't use the CTL+ALT+DEL warm boot). Your computer should rebuild the CMOS table with default BIOS settings and you should be able to continue the power on self test through booting to your O/S. If you get this far, check the memory you purchased for compatibility with your mainboard and existing memory.

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How to re-flash a BIOS

by jsilden In reply to How to re-flash a BIOS

The question was auto-closed by TechRepublic

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How to re-flash a BIOS

by maxwell edison In reply to How to re-flash a BIOS

NVRAM error:
NVRAM, nonvolatile random access memory, is a form of static random access memory whose contents are saved when a computer is turned off or loses its external power source. NVS, non-volatile storage, is implemented by providing static RAM with backup battery power or by saving its contents and restoring them from an electrically erasable programmable ROM (EPROM).

Checksum error:
This most likely means that there are incorrectly configured CMOS settings. (Prematurely shutting off the power, among other things, could cause this.)

You most likely have a corrupt CMOS because of a previous power issue problem. I would suggest two things.

First, simply change the computer CMOS battery. This may fix the problem. If not, it’s possible that it was a contributing cause to the problem.

Second, if necessary, Flash the BIOS to repair the corrupted settings.

Flashing a BIOS is a delicate and potentially damaging process. However, if correctly implemented, it is reasonably safe and fairly simple. There are slightly different procedures for different BIOS manufacturers. Since you didn’t mention your particular manufacturer, I would suggest that you go to the manufacturer’s Web page and search for the BIOS upgrade options. You’ll most likely get the best results by going to the motherboard manufacturer Web page, ASUS, for example.

AWARD and Phoenix are the predominant BIOS manufacturers. (AMI could be present on older systems.) You’ll need current version numbers to fid the correct upgrade.

See these links for the issues and instructions related to flashing the BIOS.

http://www.motherboards.org/articlesd/how-to-guides/42_1.html

http://www.techtv.com/screensavers/answerstips/story/0,24330,3336702,00.html

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How to re-flash a BIOS

by maxwell edison In reply to How to re-flash a BIOS

Be advised, however, that a corrupt CMOS could ALSO be the result of a faulty motherboard or even a bad power supply. Reading the following article should be helpful as well.

http://www.pcguide.com/ts/x/comp/mbsys/biosCorrupted-c.html

REMOVEany SPACES that may have snuck into the pasted URLs.

Best of luck.

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How to re-flash a BIOS

by jsilden In reply to How to re-flash a BIOS

The question was auto-closed by TechRepublic

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How to re-flash a BIOS

by TheChas In reply to How to re-flash a BIOS

The CMOS memory that stores the BIOS settings cannot be returned to the previous settings once it has been cleared using the reset jumper.

Have you tried removing the new memory, or reseating the memory modules?

I also wonder if the new memoryexceedes the maximum memory for the motherboard or memory socket?

I have seen many strange POST errors when new memory is either incompatable with the old memory, or the motherboard.

Unfortunately, NOT ALL DIMMs or SIMMs function in all motherboards with the appropriate sockets.
Double check the mfg memory recomendations versus what you just added.

Chas

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How to re-flash a BIOS

by jsilden In reply to How to re-flash a BIOS

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How to re-flash a BIOS

by jsilden In reply to How to re-flash a BIOS

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