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First possiblility is too much load on the power supply. Unplug the power connections to everything except the HDD you boot from. If it powers up buy a larger power supply.
If it still doesn't power up, it's a bad power supply. Check the output. You should have -5vac, +5vac, -12vac and +12vac output. If any are missing replace the power supply.
Here is Windows Xp requirements:
PC with 300 megahertz or higher processor clock speed recommended; 233 MHz minimum required (single or dual processor system);* Intel Pentium/Celeron family, or AMD K6/Athlon/Duron family, or compatible processor recommended 128 megabytes (MB) of RAM or higher recommended (64 MB minimum supported; may limit performance and some features) 1.5 gigabytes (GB) of available hard disk space* Super VGA (800 x 600) or higher-resolution video adapter and monitor CD-ROM or DVD drive Keyboard and Microsoft Mouse or compatible pointing device
you might wanna have to open the computer case and check to make sure that the power supply cables have been connected properly, also make sure the hard disk, CD/DVD drive, and memory are all connected properly and wait for about five minutes then turn it on.