Wow, do I need help. I have been working on 2 computers all week on my spare time. I have an old Dell Dimension 4400 from 2002 that I wanted to fix up for my daughter but kept getting during installing the operating system on the hard drive "set up does not detect hard drive disks" or whatever. The drive I was trying to use was once the primary Wester Digital Drive that came in it from Dell and I upgraded to a 160 gig and made that one my slave drive. So I was going to take out the 160 gig and put it in a computer that I am building for my son and put the 40 gig back in the Dell as the Primary Drive but kept getting that message. Take it back out and put back in the 160 gig that already had the operating system and it would work fine. So that is how I found this website. I did everything others suggested. My BIOS didn't have the options that worked for so many others, I formated the hard drive, ran error check on it and so on and so on until I finally gave up and just used the 160 gig I had and went and bought another 160 at Best Buy, they have a good deal on it right now. 60 bucks. Anyway now to my new problem. I have everything for my sons computer, It has a INTEL P4 MOTHERBOARD & CELERON D 2.26GHz CPU FAN COMBO and here are the specs: CPU: Socket 478 support Intel Pentium 4 Prescott processor; Hyper-Threading support; FSB 533/400MHz Chipset: SiS 661GX & 964L Memory: 2x 184-pin DIMMs support DDR400/333/266 Memory; Max capacity 2GB Slots: 1x AGP 8X; 2x PCI slots; 1x CNR slot IDE: 2x UltraDMA 133/100/66 Audio: C-Media CMI9761A 6-channel audio Codec Video: Embedded Real256E 3D Graphics with 64M share memory LAN: Realtek RTL8201BL 10/100Mbps Fast Ethernet PHY Ports: 4x USB 2.0 Ports + 2x headers; 2x PS/2 ports; 1x Parallel Port; 1x Serial Port; 1x VGA port; 1x RJ-45 Port; 1x Audio I/O (Line-in, Line-out and Mic-in) Form Factor: Micro-ATX, 244 x 200 mm Package: Retail I bought it on ebay. I hooked it up to a powmax tower. I hooked up the new 160 gig hard drive right, the DVD/CD Drive, floppy and graphics card. When I turn it on it turns on , lights up and than in the BIOS it says it does not detect the Primary Master and the Secondary Master. I don't have slaves on them. Funny thing is I will let it sit for a little go in and hit power and it will detect them for a few seconds maybe a minute and than stop. Even start to run the windows CD I have in the DVD and than just stop. I don't know what is up, I tried clearing the CMOS but that does not work. I just have to go back into BIOS to set the clock and date again and still no detection. Can anyone please help me with this. I am spending way to much time on these computers....my wife is about to kick my ****!!