Upgraded RAM, now GPU won't work.

What I would do is take out your original 2x1 and try it with your 2 new ones. If you have different color slots make sure they are in the same color.

CMOS checksum bad... clear the cmos... should be a jumper on your board, and redo all settings in the bios.. RTM..  and how is you PSU holding up?

AND (pretty darn important) check voltage specifications on your memory modules, and never (in case you're not 110% sure of what you're doing) mix memory modules with different voltage specs. The specs should be available on the memory module itself or it's packaging. Also note that you might have to set the voltages manually in BIOS, check your motherboard manual for info on how to do this.

(For example, I've got 2x2gb DDR2 PC8500 Corsair Dominator, and they require 2.1V to run optimally, and if I'd try to run them at the DDR2 bus standard at 1.8V there would probably be a lot of system stability issues, and those can include graphical issues.)

Took out the 2x1gb, and after double reboot no more CMOS and the graphics card registers again! I think 4 gb of RAM should be sufficient for now, so I will stick with that.

Edit:

Or not. It seems to do it whenever it cold boots. A reboot after it was already on seems to be what causes it to work properly. I just turned on the fast boot option, which if I am lucky will mean it goes through the warm boot process even when it is cold booting... Will post in a few mins when I cold boot it back up.

Edit 2:

Still no luck.

@pettson: Dunno how to change voltages on this mobo. The manual is of no use, and itself has enough typoes to suggest they had it written by an illegal immigrant who only speaks spanish and then was edited by a Chinese worker on their assembly line who only speaks Chinese. They have a software app specifically for OCing and such, but can't seem to find a version for vista (xp and below it seems). My PSU should be more than adequate; its an 850W with plenty of juice. Also, checking my previous memory (2x1g) it was the same voltage as my new memory, and I had no problems with the old ones working. 

Edit3:

And now it cold booted w/o giving my the CMOS. Methinks this is the definition of insanity... Doing the same thing over and over but expecting different results. Or in this case getting different results.

Could be a case of a bad batch of ram you've got on your hands if it's not the voltages as that will definitely cause all sorts of funky and unrelated errors. Have you tried running programs like memtest to check for errors?

Can’t run that.

RTFM again.....pictures et al.

Unplug and push Power button. Clear CMOS (short JBAT next to reset button). Boot to bios and set 'Optimized Defaults'. Save, exit, boot back into bios and set correct settings.

Bios settings (5-5-5-15-2T) at 2.1V. 1066 Spd. AMD only supports 2 slots at ram rated 1066 / 4 slots at 800.

If you're still having problems, flash to 1.7 bios.

Huh????   I'm running 2x2gb and 2x1 gb of DDR800 on a Gigabyte GA-MA770/S3 with an AMD Athlon x2 6400, and I'm not having any issues with system stability or graphics card.. an 8800GT.

Is that because I'm running DDR 800, not 1066?  I'm curious because I had considered upping my RAM to 4x2gb of DDR1066 after I've put in the Phenom II x4 920...

Would go the 940 but they're as rare as hen's teeth at present, and those who do have them are charging an arm and a leg right now.... AUD$499.90 and up.  From what I'm reading, this does not mirror US prices (even at current exchange rates), so somebody's cashing in big time at our expense.

...Dickhead.

I wouldn't. Take it to 2 x 2 and run at 1066. 

That's what ya get for living on an island......160 in the Colonies......

Thanks for that... I had not long woken up... needed a jolt to bring me into the land of the living. 

Wouldn't 4x 2gb = 8gb DDR800 be better?

It's not being on an island... more like entreprenurial greed.  Last week I could pick up a Phenom II 940 for AUD$344.00 on line... but most outlets have no stock, and those that do have jacked up their prices.

$160 in the colonies should equate to around AUD$221... add a bit for shipping/import duties, yes, but it's nowhere near worth an extra $280 - $300 +.

Sounds like you overwrite part of the graphics cards memory when using more than 3GB. What motherboard do you use?

Some motherboards have a setting in the BIOS for memory remapping, you may need to activate that if available. Also, make sure you have the latest bios version.

EDIT: Apparently it's called "memory hole" on some bioses.

It seems to be working ever since Edit 3...

Not sure if its just magic or if it had to do with me telling BIOS to 'Load Optimized Defaults.'

I use the K9A2 Platinum mobo

previous RAM

current RAM

Memory mapping is the likely candidate. I've seen this many times when upgrading memory. Might be a BIOS setting to tell the system how much memory the card has, might be telling it where to map the video memory.

If it were power, you should be able to set all youtr memory BIOS controls to AUTO. that usually gets rid of any customsettings that might have been a problem. If you are alreadya t AUTO then BIOS wouldn't likely be the problem. But I have seen where more memory can be enough to cause an under powered system to stop working. More power supply would then ne the answer. Thermaltake.com has a powersupply calculator where you define what you have and it tells you rather accurately how much power you are using/needing. Check it out.

http://www.thermaltake.outervision.com/

Actually high-end memory tend to be incorrectly powered by the automatic settings. Most bioses don't automatically set voltages higher than 1.95V or so regardless of what the memory is specced for because it's considered to be overvoltage.

As said already, many BIOSes (those without EPP detection and automatic configuration via EPP settings - most motherboards don't use EPP config by default, as not all memory modules use the technology) don't set the Voltage correctly, and when you got a memory module rated for 2.0V (as the XMS2 modules should be rated at) or 2.1V (which the Dominator modules should be rated at) running at 1.8V you're bound to run into problems sooner or later. When pushing the computer hard and you're memory is 0.2-0.3 below it's specified rating there's a high probability of instability.

Memory Voltage settings in BIOS often goes under "Overclocking" settings, or "Performance" settings. I'd strongly recommend you check this, as especially when using more memory modules running them below their specified Voltage can be problematic. (This can't really be understated, so that'd be the third time I mention that by now ^^)

Also, running a system with a full setup of memory modules, especially ones that require some more oomph (2.0V+) can be problematic, no matter if you got everything setup correctly. Many motherboards have problems handling it due to power distribution issues and such. I'd never recommend filling all memory slots with performance memory modules, as the M/B most likely wont be able to handle that. (I've had countless support issues with this in my work, so this is a relatively common occurance.)