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Sounds like your CPU isn't recoginsed properly.
Can you explain more details, any changes you have made etc.
firstly thanks for responding.
but it's too bad that I can't remember all details needed.
in other words, it just happened when I use it and then I only find it read as 1,86ghz on the next booting.
since that incident, I haven't made any change on my cpu except replacing old memory and display adapter.
Did it happen once and now it's OK or is it still doing it?
Are you happy to take a look in the BIOS and check the settings?
it's still doing the same old way to boot
I've visited bios check many times but when I forced to make my processor to be detected as 2,66ghz (by changing one of the power options) the cpu doesn't start at all.
it's just beeping once and then restart but everything turns back to 1,86ghz detection.
I'm still wondering how could it be that way, even some technician said this is their first case
what a mess.. haha
Try resetting the the BIOS to optimised defaults and see what happens, it could be that your heatsink has come loose and the chip is throttling back to stop it's self being damaged.
If all else fails then I guess it could be damaged, you could RMA it if possiable.