I have a Dimension 3000 that is running really slowly, so I decided to upgrade the RAM from the original 256MB to 2GB. When I put the new RAM in, the computer beeped (1-3-2), and wouldn't go any farther.   The lights in the back show green-yellow-green-yellow, which indicates that the RAM has some compatibility issue, but I can't figure out what that issue may be since it seems to be exactly the type of RAM I need to upgrade the computer.  When I put the original RAM back in, all works fine again.  Can someone help?

Thanks!

I bought the following:

Corsair TWINX2048-3200PT 2GB Kit DDR400 XMS3200 Memory Retail

Features

Manufacturer   Corsair Memory Memory Size   2GB Form Factor   184-pin Standard Warranty   Lifetime Manufacturer Part Number   TWINX2048-3200PT Memory Technology   DDR SDRAM Manufacturer Website Address   www.corsairmicro.com Number of Modules   2 x 1GB Memory Speed   400MHz Product Line   XMS Product Name   XMS 2GB DDR SDRAM Memory Module Product Type   RAM Module

Tech Specs

Memory Size   2GB Form Factor   184-pin Manufacturer   Corsair Memory Standard Warranty   Lifetime Input Voltage   2.5V DC Memory Technology   DDR SDRAM Manufacturer Part Number   TWINX2048-3200PT Manufacturer Website Address   www.corsairmicro.com Number of Modules   2 x 1GB Product Line   XMS Memory Speed   400MHz Memory Standard   DDR400/PC3200 Product Name   XMS 2GB DDR SDRAM Memory Module Module Configuration   128M x 64 Error Checking   Non-ECC Signal Processing   Unbuffered Product Type   RAM Module CAS Latency   CL3