Ji Jiji old computer does not have a lock to open

The old computer to use at times when death, according to the Death after re-starting on the button does not open up and display that did not react as if not open, but the electricity board, CUP fans in turn.And that Death is the most interesting when you To pull the power cord, then plug in, the board will automatically switch to power up CPU fan.But do not open or opened.But it put the computer in half a day will be able to open another opened.Will be able to use the time.Chassis bad speaker Can not listen to the voice.
In the crash, I tried for the hard disk, a power-for-all as useless, that is now on the motherboard, graphics cards, CPU of the three, that the three most May be a problem? Not rule out the possibility, of course, power and hard disk.I do not quite understand
Thank you, a friend who said that under the

1.Cpu temperature may be too high,
:cpu and heat sink bonding is not good, re-use silicone adhesive.
2.Motherboard memory does not work with your golden volatile liquid or wipe us The CPU has been a long time to gel