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A new Os (XP) will allow the second drive even if the old one will not. Of course you can always add a USB hard drive and a USB PCI card to make it all work. What are you using this pc for seems a little old for todays applications. Suggestion If your going to use this that you Replace the main hard drive with a 120GB or larger, new video card at least 256MB if not 512 and at least 1 gig of memory as I believe it will only take a max of 1 gig. you cannot use vista as it requires more resources than this Pc can give to support the OS. you may want to try XP LITE as well one you get XP installed to speed it up a bit!
1. There is a problem with your new RAM even though it supports up to 4 GB it doesn't mean that 1 GB of RAM is compatible. It's possible that the 1 GB DDR2 that you have installed is not supported by the system bus of the motherboard and won't make it through startup because of compatibility issues.
2. Try getting RAM from this dealer because its compatible with your motherboard and supports the system bus http://www.pcmemorystore.com/Intel-Intel_Motherboards-D945GCZ-ram.htm
1.6 System Memory
The Desktop Boards provide the following memory features:
• Two DIMM sockets supporting one of the following10:
2.5 V (only) 184-pin 200/266 MHz Double Data Rate (DDR) SDRAM DIMMs with goldplated
3.3 V (only) 168-pin 133 MHz Single Data Rate (SDR) SDRAM DIMMs with gold-plated
• Unbuffered non-ECC DIMMs only
• Maximum total system memory: 2 GB; minimum total system memory: 64 MB
• Serial Presence Detect (SPD) DIMMs only
• Suspend to RAM
I had the same issue on this board where it came with a Samsung 512 MB 533 MHz PC2-4200 DDR2 DIMM. I put in a 1 GB Kingston with the same specs (533 MHz PC2-4200 DDR2) and it would not recongize the Samsung anymore with the system reading as 1 GB of RAM instead of 1.5 GB. Tried every configuration and would only see the Kingston. It would only see the Samsung if I pulled out the Kingston regarless of the slots I use. So, I just bought the exact same make/model of Kingston and it recognized that fine and the system now has 2 GB of memory (max this board allows). And, I had already installed the latest BIOS for this board from Intel before doing all this so wasn't an old BIOS. I'm figuring the board didn't like something about the Samsung memory (speed, module configuration, etc.) that made it not play nice with the Kingston. If interested I bought the DM8400A/1G Kingston modules. And, this board appears not to support dual channel memory. Only has channel A, slots 0 and 1, and I read need two channels to support dual channel (seems obvious). Boards that supports dual channel memory normally have 4 memory slots, two for channel A and two for channel B, then put in matching modules in slot 0 for channel A and B and have dual channel memory access. And if want more ram, then matching modules in slot 1 for channel A and B.