Checksum error problem/ SOLVED

[pank]

Hello everybody,
I' m Panagiotis from Greece and here is the problem i have. This is my system :
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System Information
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Operating System: Windows XP Professional, Service Pack 2
System Manufacturer: AWARD_
System Model: AWRDACPI
BIOS: )Phoenix - Award WorkstationBIOS v6.00PG (SIS 648 FX-A)
Processor: Intel(R) Pentium(R) 4 CPU 2.80GHz (2 CPUs)
Card name: NVIDIA GeForce 6600 GT
Memory: 1024MB RAM

The other day changing some settings in my BIOS i had black screen and no response when i tried to enter setup (del). I cleared the JP1 jumper, which resets my bios settings to defaults. After that everytime with my first boot, and only with my first boot, i have a checksum error message telling that a new cpu was detected and prompting me to press F1 to continue or DEL to enter setup. I 'm changing some settings but when i turn off and boot again i have the same message and the date and time of my cmos is reseted.
I tried the following with no result:
1. Changed the cmos battery with a new one
2. Load Fail-Safe Defaults option
3. Load Optimized Defaults Option
Another thing that i noticed is that there is an option in my bios settings which is called :
Over Clock Function (enter)
When i press enter i can see the following options :
CPU frequency (200)
Over CPU Vcore function [normal]
Over DDR Vcc function [normal]
CPU:DRAM Frequency Ratio [SPD]
I think the value on CPU frequency, wich is 200 in my case is a bit strange. What do you think ? Do you think tha changing this value in 100 fo example will resolve my problems ? Do you have any suggestions for my problem.

                                                     Thank you in advance

[contrex]

Your cpu frequency of 200 MHz  is the normal one. That is the "front-side-bus" frequency. It is internally multiplied (In your case 14 times) inside the CPU to provide the actual CPU clocksignal. Do not alter it unless you want even more problems!

[pank]

Thank you Contrex. Now i'm trying something else. Somebody told me to leave my p.c. open for 24 hours and see if this help's.

[hyperhedron]

try updating your BIOS, and let us know what happens.

[GX1_Man]

try updating your BIOS, and let us know what happens.

There is no need to do this, as it was working fine before. 

[street1 (RIP)]

try updating your BIOS, and let us know what happens.

There is no need to do this, as it was working fine before. 

That is correct.Updating a BIOS is a last resort.

[patio]

Do you happen to remember the other changes you made in the BIOS ? ?

[pank]

I think that the settings i changed and create the original problem (black screen, no response from keyboard) are settings related to dram cas latency. But i think that this can't be a problem cause i cleared the cmos and everything returned to default and i am able to boot into windows and once logged on my p.c. work's like a charm. The only problem is that for some reason cmos doesn't keep date/time/settings and everytime with my first boot, and not with a restart for example, i get the checksum error message.

[pank]

Problem solved by just installing the battery the wright way (writing up).
Thank you all

[contrex]

Problem solved by just installing the battery the wright way (writing up).

What, like the one you took out?

You know, I wondered about that. It was clearly not holding CMOS contents while powered off.

[patio]

Which it wouldn't with the battery in upside down.

[contrex]

The lesson is, before changing or removing anything on the mother board, make a little sketch of how things are and put in all kinds of information such as "battery has writing facing upwards" or "red wire goes to left" etc. You'd be surprised how much time and trouble can be saved.