I have run into some probelms in attempt to clean-set up a Win2000pro to my Pt4 desktop with newly formated and partitioned HDD. I replaced the motherboard with a new P4B266 from Asus. So, basically this is a plain PC without anything in HDD and I could use DOS only. After carefully checking around making sure everthing was ready, I switched on the power. Shortly, the starting stopped at 'an invalid system disk, please replace....try again', while I was sure there was nothing in the FDD. If I booted with a boot disk aquired from Win98, I was brought to the A:\ without problem. I could even move around different drives. However, when I inserted Win2000pro CD into CD rom and type 'dir' under E:\ (the CD-ROM), I was shown a list of files that are surely not from the Win CD. Later I found that no matter what CD I insert or even no CD inserted, I was shown the same list of file when 'dir'ed. So, I guess there must be something wrong and likely the CD-ROM was not recognized. I got into the BIOS (AWARD) and could not figure out anything abnormal, accept the BIOS layout appears to be different from what I used before, a same AWARD BIOS.... Can anyone tell me what could be going wrong before I get intouch with the maker of MB? Or, I misunderstood the way of setting up Win2000 with that of Win98? Thanks a lot! Ewen - Users can unsubscribe from this list by sending email to 24hoursupport-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field OR by logging into the Web interface at http://web.tampabay.rr.com/spider1/24hrsupport.htm.