Hello, i hope you can help me with this problem. I have a desktop HP Vectra VL400, pentium III 850 Mhz. This is the sequence of ocurrencies: 1. After booting could not log back into windows XP. It would make high a high pitch noise followed by 6 beeps 2. Upgraded the BIOs from HP and flashed it. It seem to go away. I can go into BIOS but not in the OS 3. Reformatted the hard drive with a fresh installation of XP but when it went to last step installing windows it did it again. 4. Ran antivirus from a floppy. It didn't find any 5. Downloaded the diagnostoc CD from HP and boot up with it and didn't find anything wrong with the PC. 6. I have another similar PC which I swapped all the parts: HD, PS, RAM but still give me the same problem. Any suggestion is greatly appreciated!