A recent RAM upgrade has caused problems including a CMOS Checksum error on my A7N8X motherboarded PC. Help!?

I had 2 x 256MB RAM sticks and bought 2 x 1GB sticks which unfortunately did not work with my PC. It seems they are 'high density' and my motherboard could not take that. I switched them back for my 2 x 256MB sticks and have had lots of errors since then. This includes the CMOS checksum error on start-up, meaning it loads defaults and I have to F1 on start-up. It has re-set the system clock, caused errors with my 'broadband medic', and caused other issues like my machine 'not accepting cookies'.

I have ordered some new RAM which will hopefully work, but how can I fix all these errors?

Answers:
There should be a f5 jumper somewhere on your motherboard. Usually little blue thing hooked up on 2 of 3 pins. Unplug the power cord to your power supply or turn it off with rocker switch on back. the blue J5 jumper will be shorting out the center pin with one of the outer pins and you will see a free pin. jumper will be on either 1-2 or 2-3 depending on board. if on 1-2 pull it off and put it on 2-3 for about 15 seconds then move it back to original spot. Do the opposite. of course if its stock position is 2-3. That should clear your cmos. That is of course assuming you went into cmos and actually selected "load setup defaults" manually then booted up.
Its most likely that you have overspent.

You most likely have brought some ram which is to fast for your computer.

Motherbaords have a certain type of ram they can take.
Theis goes from 500mhz Upto the new 1033Mhz.

and of course, motherboards have size limits. Most likely yours is 1GB.

So i say, get a lower speed, or find out what speed your motherbaord can take.

Good luck!
Here are some stupid questions i have to ask: are you using the right kind of ram? the kind your motherboard supports? are you overclocking anything? if so reset to default

google search memtest for windows, download this, unzip it and run the program its very simple. If/when it fails, take out 1 ram stick, test again, and repeat with the other only 1 in at a time, if both of them fail, then my guess is there is something wrong with your motherboard and not with the ram, in which case i suggest taking it into a shop.
the checksum error is because it knows theres more ram, its NOTHING to worry about, go into the bios, do nothing, save it
solved
ignore the comments about memory, this is perfectly normal
the errors bar checksum wont happen with correct memory

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