Overclocking Problems

[Cooler666]

I overclocked my P4 Northwood 1.8A processor to 2.1Ghz at FSB 117 and when i start the computer the first time I can go into Windows XP and everything is fine, but when I shutdown the computer and open it again it will not boot to Windows XP.
I tried upping the voltage up to 1.625 and it does the same thing.
I tried FSB's from 117 down to 113 and same thing.
At 112 FSB (@2Ghz) that works fine but i get lockups inside Windows XP sometimes.

Could this be because of my power supply?
It is a Aopen 300W which i got with my case.
My load temperatures are around 48Celcius when i overclock, just one or two degrees higher than when its not overclocked. When it's not overclocked there are no lockups.

I have the Zalman Sunflower and two fans blowing in on it (better temps i checked that blowing out).
(Motherboard Abit TH7II-Raid with 512 Samsung RDRAM)
Tell me what you think, thanks.

 

[ucfswimmer]

theres the possibility its because of the PSU..get a program to monitor your +5v and +12v lines and see if they are dropping or fluctuating badly...its possible it could also be because your northbridge..not the cpu..is overheating, is it actively cooled?

~jeff~

 

[Cooler666]

My +5V line flactuates between: 4.92 and 4.95
My +12V line flactuates between: 11.86 and 11.98

is this ok?

 

[Tecumseh]

My +5V line flactuates between: 4.92 and 4.95
My +12V line flactuates between: 11.86 and 11.98

is this ok?

This looks fine, but are you sure you are not missing
dips in the voltage when your HDD or CDROM drives
kick in?