why does it do this?

ok i overclocked my system from 2.6ghz to 3.4 and my computer has the cooling ability to go to at least 4.ghz but after 3.4ghz my computer monitor will not respond so the computer wil be on but the monitor will be like the computer is off and it wont boot up why is this? also when i switch my computer to top performance in the setup screen at startup it has a flicker problem?

SUp im a expert in PCS hardcore First tell me what your specs are Cpu RAm VId Card Cooling MOtherboard

problems your saying might be UNstable Ram CPu cant handle it motherboard errors voltages just post your specs and ill see wat there is to work with

need more specs/voltages

you need better cooling. if it was merely unstable then you could go for a higher voltage, but when it goes blank then the computer needs a cmos flash, which means you take out the battery, possibly change a jumper back and forth, and then put the battery back in. that resets the bios settings

2.6ghz p4 overclocked to 3.4
512mb kingston 333mhz to 356mhz
nvidia 5600 128mb ddr
gigabyte GA- 8ST667 titan 667
thermal take 6500rpm titan 4 cpu cooler
2x LED fans & one black one sucking air at the front of the case
pinacle pro tv card
audigy 2
pioneer 24x dvd 48x read
52x24x52 burner liton
300w task power supply

i changed the clock mhz in the setup screen at startup from 133 to 170 anyfurther than that it hangs, but it says its capable of 355 i dont know hjow to change voltages and jumper setting on the motherboard let us no how to do it, cos my comp it keeps chkdisk at boot

sorry i mean a thermal take spark 7 sorry its too early in the morning (8:30)

what ur core voltage...?
ddr voltage?
and u should have got some good ddr400 b4 trying to oc neways....

Your monitor doesn't go on (stays in stand-by mode) because you've overclocked it (the CPU) too much. You say it can go to 4 ghz...I doubt it. Most people who get 4ghz or near that, especially with a 2.6 ghz p4 use water cooling. (and even then I don't know of many people who can keep it stable for too long (like playing a 3D games for a few hours))

I'd say you simply overclocked it enough. I wouldn't suggest screwing with the voltage settings since that automatically brings the CPU burning risk up. You could play around with it, but if you plan on taking your CPU speed from 2.6 to 4ghz, you'll most likely burn it. Also, the memory might not handle that FSB speed.

Perhaps you should also think about upgrading your PSU, 300watts may not be enough juice? 420 should be ok tho.