I know it should but it does not. It occurred to me now that its the battery , but right now I don't have a replacement for the coin type battery. Even so , I've had things like this happen in the past with other PCs, in which case a computer can still boot and it lets me access the BIOS menu, it just wont retain the changes. But not this one. This mobo is operating in "radio silence" or some thing. No BIOS error messages. I already know what keys to use for various BIOS makers but this is new to me. I tried all the F keys , DEL, ESC, and even shifted Function keys. Nothing gets me to the BIOS. I even went to the Intel website to make sure, and its indeed F2 , but it does not work. (I press it at the BIOS splash screen with "Intel motherboards" logo. Well, I've also discovered that the BIOS is the one showing the "Windows boot & reboot" screens. Because I've disconnected the HDD & removed the Windows CD but this id*** BIOS is still at it pretending to be Windows boot menu. I even plugged another HDD with a good windows install but I could not boot that one either (normal IDE plug though), its the BIOS that keeps lying to me . Any how, the original HDD is SATA, its the same one I've posted about in May 07 here. I couldn't come back to check for replies at the time because i was also having problem with ISP back then. Now when it looked like there is a fix , I can't even boot the PC. Its a P 3 Ghz , win XP pro. By the way thanks to everyone who replied back then