Hello Fraser,
Please bear in mind that this product has reached its End of Interactive Support since 2004 so Intel no longer provides interactive support for this product via telephone, chat or e-mail.
http://www.intel.com/support/motherboards/desktop/sb/cs-016974.htm
You may want to try basic troubleshooting:
- Test the system out of the chassis, minimal configuration please. (Motherboard, processor, power supply, 1 memory stick and video card)
- Remove the CMOS battery and leave the system without it for about an hour. Then put it back on and restart the system.
http://www.intel.com/support/motherboards/desktop/sb/CS-028780.htm?wapkw=clear+cmos+battery#datetime
-Install the latest BIOS version available for your board https://downloadcenter.intel.com/SearchResult.aspx?lang=eng&keyword=%22d845wn%22&DownloadType=BIOS
-If the motherboard is still under warranty please get in touch with our Warranty Department and ask for additional information since the replacement option for this product is not available anymore. http://www.intel.com/p/en_US/support/contactsupport
Regards.