COMPAQ Presario from 2005. MSI 7184 motherboard. 2 SATA disks, one optical IDE drive. XP. Has been working fine for 5 years. Then got ‘boot failure – insert system disk’. Booting again fixed it, but not for long, it is solid now. Going into setup (AWARD, rather few options) I see only the optical disk (which is on an IDE controller) being recognized, the other ports showing ‘None’. Detecting the disks makes no difference. I can hear the disks go ‘click’ on power up and they spin. I tried the following: 1) Switched cables (using the existing cables). Switched the system disk to the other (secondary disk) SATA slot. Switched cables again. Took out the secondary disk. Switched slots and cables for the remaining system disk. For the rest of the story I did not connect the secondary disk again. 2) Reset MB config. Looks like it was running with the defaults as I saw no changes in the disk and controller enabling settings 3) Took out the battery. For good measure. I don’t think this resets a lot. 4) Put the system disk in another PC. It booted fine. 5) Connected an old system disk with W98 on it, but to the IDE cable. Booted fine. 6) Found the latest (2006) BIOS version on an HP website and flashed it, using the W98 disk. The update went fine, according to the software. 7) Booted from an XP CD (mine, not the original one), went into repair, tried FIXBOOT and FIXMBR.With the original system disk in it, of course. 8) Booted from my CD and pretended a Windows install. Hit F6. But I do not have any SATA drivers, if they would have been needed at all (anyone know?) and the XP disk did not provide any help here. 9) Finally found an SATA disk and connected it to the board. Same problem. I would not have posted this if I could find another MSI 7184 board, but I can’t. It is even difficult to find a MB with a socket 939 and the options I need. Question: Did I miss anything? I do not have a known, working SATA disk other than Unlikely that 2 cables went failing at the same time. The system disk boots in another box. Another, known good, disk gets the same boot failure. Serial ATA controller, right? Thanks for any help, new ideas or a replacement board for this machine. The HP product number is SR1579FR, btw.