I have an older Athlon XP 1800+, Asus AV7333-x MB, 1GB Corsair Memory, 512MB 6200 GeForce GPU and a 250W PSU. I recently purchased an Athlon XP 3000+ CPU and replaced my 1800+ chip. Left in only the CPU, Vid Card and Mem, powered on and so do all the fans but within 3 seconds it automatically powers off. I've put back my 1800+ CPU and its working fine. I'm thinking it may have something to do with the PSU and not having enough juice to power the new CPU. Any suggestions/advice from you knowledgeable experts? Am I correct in thinking it could be lack of power and perhaps I should upgrade to a 400W PSU? Thanks for any help y'all can provide.

i'm assuming you verified that the CPU sockets are the same. it's possible that you didn't properly apply thermal grease and the Heat Sink/Fan (HSF) when you installed the new CPU. If this was the case, though, i would **think** that you'd have had trouble putting the old CPU back as well. Did you use thermal grease? did you clean off the old residue first? did you apply too much? The only other way to test without spending more money is to unplug all the unnecessary peripherals from the Power Supply Unit (PSU). Disconnect all Hard Disk Drives (HDDs), use onboard video if supported and take out the video card, remove all PCI cards (sound, network, etc), and disconnect your optical drives (CD/DVD). You should only have a PSU, Motherboard (mobo), CPU, and RAM. With this config, you should be able to get into the BIOS.

Which version of the 3000+ did you get? 400MHz FSB CPUs are NOT supported by your board. But assuming the CPU you have IS supported, you need to update the BIOS to the latest version using the 1800+, THEN install the 3000+. http://support.asus.com/cpusupport/...

Both processors are Socket A (462). Like UpAndComing,I suspect cpu overheating too; that board has ASUS C.O.P. cpu overheat protection and will shut down in a hurry. Here's how to apply thermal interface material for that processor... http://www.arcticsilver.com/pdf/app... Edit: Good catch jam. The 333Mhz flavor should read something like AXDA3000DKV4D and the 400Mhz flavor AXDA3000DKV4E. Skip

Thanks everyone for the quick replies. Yes, I do have the KV4D version. Additionally, I checked Asus' website before making the purchase to ensure that my bios version (1003) and PCB Rev.2.01. were supported. I may update my bios to the newest verision 1005, though I'm not a big fan of that in case I end up with a huge paper weight. I'll try and apply some more thermal grease and see if that helps as well. Does anyone here think it could be a lack of power? I have 2 optical drives, 1 hard drive, 1 floppy drive, 1.5gb mem, cpu fan, 512MB APG 4X Video Card, and the CPU all running on 250W.

NO NO NO, not 'more' thermal paste. Possibly 'less' or 'correctly'.

Thanks aegis1. I checked SkipCox's link and I think I'll need to remove the old thermal grease that was left on from before using some Iso. then apply a thin amount of thermal grease. Just one more question, when I remove the thermal grease and I'm using ISO alcohol, the Artic Silver article reads to 'rub' off the grease from my CPU Core. Do I use simply my finger and rub gently, or is there a tool that would help in this instance? Thanks again everyone for the help. Its mucho appreciated! :)