Screen goes blank loading X after upgrading memory

[Joachim Struss, Antonia Kostarakis]

On Fri, 2007-09-21 at 22:38 +0200, Marcelino Luna wrote:
> I have this strange problem that is driving me nuts.
> 
> Since I upgraded my PC (Kudoz 7 motherboard with a memory frequency of 
> 266 Mhz, an Athlon 1400Mhz and an Nvidia Geforce 4200) with a 512MB 
> DDR-333 module (a total of 1GB) Kubuntu seems to start but when the X 
> server loads the image on the screen goes blank (the monitor 'says' it 
> has no signal). Meanwhile I can hear what seems to be the desktop 
> finishing the loading.
> 
> The machine seems to work well with Windows and so it does Linux if I 
> let it with just 512MB, the old two 256MB modules or the new one.
> 
> I've tried to install Kubuntu on another hard disk and the problem arose 
> just when I installed the Nvidia drivers.
> 
> Any ideas?
> 
> Thanks in advance
> 
>     //.arce

I know exactly what it feels like. I have the same problem, but with a
new install on a computer I just bought.
My system: Intel C2Duo. Graphics: Nvidia GF 8500GT (512Mb). Monitor:Acer
1680x 1050 resolution. 
I tried to install the 64bit edition of Gutsy. Monitor of. After that I
tried the 64bit Feisty. Same thing. Well it actually installs and boots.
I was able to switch the monitor back on after a minute or so and was at
the login screen. I am dual booting though and was not able to access
the boot option screen anymore. 
This is only happening to me with the 64bit edition though. I have since
gone back to the 32bit and do not have any problems with it.