Post code error 9F BOOT FAILURE

My system will not boot anymore and I am getting a sequence as follows:
83 - 96 - 9E (for a slit second)-9F
on the post code definition display on the mobo.
When it hits 9E it has shutdown and reads 9F when totally powered off.
I have read on other newsgroups that the power supply might be at fault
as it requires 400+ watts.

System specs as follows:

ABIT AG8-V MAINBOARD

INTEL 530J PENTIUM 4 LGA775 WITH AKASA AK-954D COOLER

2 X 512MB PC3200 (PC400) MAJOR ELIXIR DDR RAM (IN SLOTS 1+3)

160GB SEAGATE BARRACUDA SATA HDD WITH COOLER

MSI 256MB PCI-E ATI RX700 PRO GRAPHICS CARD

Hope someone can shed some light....Thanks

17" CRT MONITOR

XP HOME INC SP2

400W PSU

3 X CASE FANS