Hi, Just off the top of my head, is the customer using any drive overlay software? If the Western Digital is installed with EZDrive, it may have installed overlay software without your knowing. This could cause a problem similiar to what you see. Try booting from a floppy and run Fdisk. Choose option 4 (View Partition Information). If this shows you a non-dos partition, then you probably have an overlay software installed. HTH, Donald Gaither -----Original Message----- From: Mike Buraczewski [SMTP:[log in to unmask]] Sent: Thursday, August 05, 1999 6:36 AM To: [log in to unmask] Subject: [PCBUILD] No DOS?! Hello to all. I am building a new system for a customer that has the following: Tekram slot 1 motheroboard / intel chipset Award 4.5 bios Celeron 433 ppga in an adapter card to fit the slot1 128 mb pc100 SDRAM Western digital 13+ GB HDD Win98 SIIG sound card etc.. The problem with this machine is simple but very confusing. In DOS mode, it does not recognize that the HDD exists. If I boot to win98 and use a DOS window, the C drive is visible. If I boot to the startup menu and select dos prompt, the C drive is visible. If I use the shutdown menu and select restart in DOS mode, the machine exits windows, goes to a blank screen with a flashing cursor [no prompt] and sits there. Pressing any key reboots the computer normally to Windows. If I boot the computer from a DOS 6.22 disk, then attempt to access the C drive, it tells me that there is not C,D,E or any other drive. I have tried to swap other drives [got an old 540 mb here] with the same results. My guess is that it is in the BIOS somehow, but after looking over the choices, I haven't a clue what in the BIOS might cause this problem. Anyone have a suggestion as to how to correct this? TIA Mike Buraczewski [log in to unmask] The PCBUILD web site always needs good submissions. If you would like to contribute to the website, send any hardware tech tips or hardware reviews to: [log in to unmask] Visit our website regularly for FAQs, articles, how-to's, tech tips and much more http://nospin.com - http://nospin.org