text: help please.... computer does not start at times? my pc p4, 256 mb ram, 40 gb hdd..  problem is that it happen so that sometimes when i start my computer it doesn't boot up.. i opened cpu cover and there is only the fan sound heard.. earlier i used to push in the ram into its slot tightly and t would work.. but now it happens rarely. i keep pc power on and some times, it takes a long time to boot up otherwise doesn;t boot up.. the monitor keeps on blinking.. the fan works but not the rest parts some times.. also the red light of hdd also blinks first and then stops.. first change the power supply and fix the power code tightly in power supply and socket.  second fix the processor fan.. (its very important) it should be very tightly fixed.. and there should be no sound in that fan  third fix all cables tightly to board. (including hard disk cables, cd rom cables)  forth change the position of ram  (it may be not working properly)  ur system is new so it will be in warranty... change it or fix this problem as soon as possible