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sometime POST cannot complete, sometime hangs after boot
I have a laptop hcl notebook "hcl notebook p28 pdc". It has boot problems, sometime it cannot start POST. I use usb POSTCARD to diagnose, power to the POSTCARD come and go and the code was always FF. sometime it can complete POST and windows boot but use to hang after some minutes with slight change in display. Temperature is high though all ventilation is properly clean. Hard disk and RAM are tested in other pc. Please help me