P3b-f won't boot,strange beep code help...please?

Greetings All,
My desktop died!
I have a p3b-f and a while back started rebooting occasionally in WinXP. At first I thought it was just Winblows. Then I started getting an error message on Bios post, warm and cold boot..."Hardware monitor found an error. Check power settings." I checked the settings and all seemed fine. A few weeks ago when I would shut down the system, XP would seem to shut down normally but then the PC would reboot, like I clicked on the RESTART button in Win. (I do not have Bios set to reboot on power failure)Sometimes on the reboot the Bois reported a 300mhz CPU instead of the 600 PIII and memory would be reported as 650MB instead of 1gig.

That went on for a while until last a few days ago. The pc starting crashing in win and would suddenly reboot. When I tried to restart I got the beep for no video. After I hit the reset button I got a two tone beep in quick succession similar to a emergency vehicle . I tried it a gain tonight and the PC started but crashed when XP was loading and did the reboot routine. This happened twice. Then the two tone beep codes sounded like they were shot and dieing...very strange sound to describe. After trying to rest PSU I just get black screen with no post. If I let the PC sit a while with power switch on back in off position, the machine will post but OS will crash just before fully loading going thrrough same routine. Sometimes I can get to the OS welcome screen. I started unplugging CD's, Hd's and USB devices but no change.

Please tell me what the weird beep code means... I tried asus site but can't find them.

System is as follows;
P3b-F
PIII 600
SuperMirco Full tower (4 case fans) plus CPU, video and PSU
300 watt PSU
2X WD Caviar (20g ?)
Maxtor 15g
Gforce AGP V6800 deluxe 32Mb
Adaptec 2940? U2W ultra scsi
Plextor UltraPlex wide CD
Plextor Plexwriter 8/20
SB audio
Thanks in advance for any advice.
john
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