New PC problem, won’t boot or post

New 2 week old system, Jetway 830CF mainboard, AMD XP Anthlon 1.5Ghz CPU, Maxtor 60Gb hard disk, 1 128 Mb & 1 256Mb memory, on board SiS 630/730 VGA, onboard AC97 audio, Linksys 10/100 fast ethernet card, 16X DVD drive, 16-10-40 CD/R, floppy, IomegaZip 100 internal drive, Windows XP Professional. System was working fine, last evening system froze, upon reboot, nothing happened, no boot no nothing, can’t even get to first screen to get into bios. Tried booting from floppy, but same senario. Hard disk starts , but dumps after a few seconds.