The 400W PSU is going to limit your CPU selection to dual-core at best, although you might be able to get away with a higher-end dual-core CPU if your RAM is not ECC and not dual-channel, and you're not running anything serious in terms of a graphics or sound card or a SCSI array.
Given your current setup I'd really look for a 1.6Ghz dual-core Athlon which has a decent amount of KB in its Level 1 and Level 2 cache, but 3MB for its Level 3 cache.
Anything beyond that ballpark of a CPU upgrade is certainly well within the bounds of diminishing returns, and you should look at getting a new PSU, motherboard, and probably RAM (I'm guessing you're using DDR2 RAM currently).
Btw, I’m available to help over the phone in case u need at
https://www.6ya.com/expert/andrew_7b5641a71b84cd85
what should i do i have same problem
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