Hi

I have a Targa Visionary 4u - Pentium 4 2,0Ghz.

It has a 256Mb/266Mhz RAM, and it works fine.
- I just installed an extra 512Mb/266Mhz RAM, and now I have some 
problems...

When I start my PC, it can not detect the 512Mb - Only the 256Mb. But if I 
Reboot just when it shows RAM, then it restarts and detects all the 
installed RAM 256+512Mb

According to my handbook the PC works with up to 2x512Mb/266Mhz 200Pins

Why do I have these problems??

I have tried to switch the RAM-modules, with the same result..
The "funny" part: If I remove the 256Mb, and only have the 512Mb installed, 
i get nothing but black screen..

Any ideas??

--- Brian 

Brian wrote:
> Hi
> 
> I have a Targa Visionary 4u - Pentium 4 2,0Ghz.
> 
> It has a 256Mb/266Mhz RAM, and it works fine.
> - I just installed an extra 512Mb/266Mhz RAM, and now I have some 
> problems...
> 
> When I start my PC, it can not detect the 512Mb - Only the 256Mb. But if I 
> Reboot just when it shows RAM, then it restarts and detects all the 
> installed RAM 256+512Mb
> 
> According to my handbook the PC works with up to 2x512Mb/266Mhz 200Pins
> 
> Why do I have these problems??
> 
> I have tried to switch the RAM-modules, with the same result..
> The "funny" part: If I remove the 256Mb, and only have the 512Mb installed, 
> i get nothing but black screen..
> 
> Any ideas??
> 

It seems to be an incompatibility ram-motherboard.
It could depend on many factors.
First of all be sure your notebook really supports 512Mb on one slot (I 
think it should do, but...).
Then try to change the 512Mb bank with a different brand one, try also 
with different DDR speed like PC2700 and 3200.

The only rule for upgrading the ram on a laptop is *try them first*...