Hi,I am using an AMD 4200+ 2.2Ghz processor at the moment and have decided to upgrade to a 6400+ 3.2Ghz. When I put in the new chip and turn on the PC it turns off again as if short of power. My power supply is a TAGAN 430w and I would have thought that this would be sufficient. Do I need to upgrade the power supply as well to maybe a 600W?If so does anyone have any advice.thanksKeith

Hellowhat motherboard do you have?

I have an ASUS M2N SLI Deluxe motherboard, and I have flashed the BIOS to accept the new chip according their their website.

HelloAfter flashing the bios did you clear the cmos using the jumpers on the MB.Try clearing the cmos then bumping up the voltages slightly.

Hi Maddog,No I didnt clear the CMOS, is this always advisable to do this when changing CPU's.. I will try that and see. How do I bump up the voltages, is this in the BIOS also?ThanksKeith

HelloYes i always clear the bios when changing CPU'sThe voltages are set up in the bios pages they will probably be set to auto and may be a little low.http://www.freewebs.com/reading1871/30.jpg

Maddog,I cannot access the BIOS as I cant get this far when booting up. As soon as I push the power switch the fan turns on and then immediately turns itself off again.!! This is what makes me think that my power supply is not up to the task.

HelloDid you reset the cmos ?http://www.freewebs.com/reading1871/30.jpg

Although the processor is faster, there shouldn't be too much more in power requirements. To see if it is a power issue, disconnect any and all CDROM and hard drives. If you have an old video card hanging around that does NOT require an extra power lead (assuming yours does), put that in and test as well. Although you can't boot up into an operating system that way, at least you will be able to give all available power to your CPU. (If it WORKS with all the power, then you probably have your answer - new power supply time!) If it STILL fails after giving it all the power you've got, put your old processor back in - see if it still works. This is a test just to be sure all is well with the motherboard.If it STILL fails... well, now you're in more trouble. Check the memory slots to insure secure seating, check motherboard power leads, check CPU fan leads... If it WORKS with the old processor, enter the BIOS and reset to defaults to be safe. Place your new CPU back in, but take extra caution to seat it properly and ensure all fan and power leads are correct. Cross your fingers, and power it back on...-Greg

Ok thanks guys for your help here.I did as you both have said, and still it does not boot up so it would appear that the CPU is faulty. All is fine with my old chip, that boots up fine. thanks again for your help...CheersKeith