Thanks very much, Jim and others! I trust all your suggestions may work, but this apears to be a strange problem. Further trials indicate that the A: prompt achieved from booting the Win98 disk is actual not working, it may move around different drives such as c:. d:, e: etc but none of those drives are virtually working. Thus, I am not able to use any of your strategies... I am describing again what had happened: I followed carefully the instruction of the new MB and assembled what I had on the old MB. After confirmation of very pieces again, I switched on the power, POST was OK and I was able to get into BIOS manu by pressing the Del key. After the POST, however, a message apreared saying 'In valid system disk, plaese remove it from the drive and hit any key' and the machine stops there not going any more... I made a trial boot using a set of 4 disks made from Win2000 CD as suggestted by Barry in previous message. This time I was allowed to install the Win2000 but the resulting OS did not work in full functionally with mouse failed and monitor worked in limited resolution (not sure other windows functionalities). This happened to my PC at home. I must work during daytime and I could only work on the problem when I get home in the evening after about 2 hours driving. So the progress is slow, please understand. The next trial I am planning now is to re-assamble again removing all unnecessary pieces to make it into a very basic PC with video card and FDD only, to see if it is due to the hardware incompatibility. Thanks again for your kinders. Ewen ----- Original Message ----- From: "Jim Harris" <hhlake@xxxxxxxx> To: <24hoursupport@xxxxxxxxxxxxx>; <ewenhowe@xxxxxxxxxxx> Sent: Wednesday, August 28, 2002 12:14 AM Subject: Re: [24hoursupport] Invalid disk and more problems.... > Ewen, > Boot from the Win98 disk and while in "A" drive type sys c: (enter) . Type > c: (enter). Type dir (enter) and make sure that the program command.com was > transferred to c: If not, type copy a:\command.com (enter). Type copy con > autoexec.bat (enter). type LH C:\MSCDEX /D:MSCD000 (enter) . Type ctrl z > (enter) . Now type copy con config.sys (enter) . Type > DEVICEHIGH=C:\GSCDROM.SYS /D:MSCD000 /v > (enter) Type ctrl z (enter) You should now have a config.sys and an > autoexec.bat file on c: drive . Copy the attached CD rom driver programs to > c: drive and reboot with no disk in a; drive. It should boot up and go to > c:> prompt. Type E: (enter) and you should show whatever is in E drive. You > should be able to install win 2000. (unless I forgot something) .....Jim > Harris > > > > > ----- Original Message ----- > From: "Ewen Howe" <ewenhowe@xxxxxxxxxxx> > To: "[24hrsupporthelpdesk]" <24hoursupport@xxxxxxxxxxxxx> > Sent: Monday, August 26, 2002 10:02 PM > Subject: [24hoursupport] Invalid disk and more problems.... > > > 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. > > > - 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.