

But now I have RAM problems. If the new Harddisk is connected to the IDE bus, it's recognized, but the built in RAM (256 MB) shrinks to 128 MB. If it's disconnected, BIOS detects the RAM size correctly, but I have no big HDD

The new HDD ist connected with an old 40pin connector cable. Could this be the reason of my problem?
Who can help me?
Thank You for help an sorry for my english!
Board: MSI MS-6156 VA Ver. 2.1 BX7
Old BIOS: Award v4,51PG (W6156 VA F1 V 2,0 110999)
Current BIOS: W6156 VF1 V 2.3 040500 128 GB patch by wimsbios team
Memory: 2 slots with 128 MB sdram (different manufacturers)
OS: Windows 2000