My computer dilemma

Users questions: Intel original 865 motherboard, Celeron D2.53cpu, 256X2 memory, max440 card because motherboard does not support overclocking, I want to change, but also want to change P43.0 of the cpu, for this obsolete also worthwhile investment? I want to find a flea market, scouring second-hand things point to complete Desire, but what you give that a good reputation in Shijiazhuang annex where second-hand shop
Experts answer: point and you about my case, ASUS 865 motherboard, p42.4b, two 256M of DDR400 RAM, 4200 graphics card. In the first half to complete the upgrade: P43.0E, plus two Memory to 1G, graphics replaced 6600, that has no hardware bottleneck of system performance. Capital investment of about 1700. Incidentally, the question to upgrade: 1. Board does not believe that U, tips microcode error, Power On Self Test drop 2 sound, but does not affect the use, not brush BIOS. 2. U serious heat, open 3D to 75 degrees, 38 degrees chassis only by transforming the old chassis and plugs for the copper fan
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