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When the CPU overheats then it will shut down (i.e. thermal overload) and won't boot up again until it has cooled down. If this is the problem is not fixed then the CPU will eventually fail. A faulty fan causes the problem or the fan and heat sink assembly are clogged with dust. Check the CPU fan to see if it spins freely, if not replace the fan. If the fan and heat sink is clogged with dust the remove the dust and make sure the vents are clear and dust free. Use a small brush and can of compressed air to do this.
you have not specified about your power on off switch, if there is any problem with rebooting by softare then press and hold the power botton for 5 sec, then your laptop becomes OFF , then press power button again to start .
A cool heatsink points to a CPU failure, as the CPU is not processing data. Replacing the CPU at first would eliminate this, however, the CPU is unlikely to fail first unless it had been severely overheated, more likely that the board has developed a fault.
If you are however getting no beeps on start up, this does look like the CPU is the culprit
There seems so many Lenovo application start when the computer start, so there will be a long time to start, you can use a softer ware to remove some of the projects.
try removing all the cards from the expansion slots and remove the ram sticks. disconnect the drive cables from the board but dont touch the cpu or power connectors. Now hit the button. If nothing changes, probable board fault. If it now boots up and starts beeping ( which it will when no ram sticks installed) shut it down and reinstall each drive connector, ram stick and card one at a time booting between each item. when the faulty item is connected, the board will stop booting and you can replace that item.
Many things can also cause this. Bad connections to ram sticks and video cards, damaged usb port connections, failed cpu's, failed psu's etc..
You may still have to take the machine to a professional repairer to have the problem diagnosed.
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