Compaq Deskpro EN SFF Booting Windows XP

Compaq Deskpro EN SFF C500 original PSU failed :( . i did my own compaq 14 pin power supply with a 24pin Standard ATX PSU :D Sys Specs: Intel Celeron 500Mhz FSB66 Mendocino 192MB RAM SDR Quantum FIreball EX 6.4GB Windows XP Sp3