Windows XP won’t sleep – Driver problem?

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I’m gradually ending life support for my XP PCs, but I’m trying to learn something. I took a Dell Optiplex 760 SATA HDD and put it in a Dell Dimension 8400 that can use both IDE and SATA. While it works, some drivers for hardware are missing, and the PC won’t go into sleep mode (just off or restart). How can this be fixed, or is this due to the missing drivers below:

1) Ethernet controller
Broadcomm NetXtreme BCM5751 Gigabit Ethernet PCI Express
VEN_14E4&DEV_1677&SUBSYS_01771028&REV_01

2)…

Windows XP won’t sleep – Driver problem?

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