My laptop shuts down after dell logo appears.After dell logo disappears,blank screen appears with cursor blinking and after few seconds laptop shuts down.
A week ago I disassembled to apply thermal paste to cpu & gpu after which temperature of cpu dropped by 15-20 degrees,so overheating is not the problem.After reassembling the laptop,it worked fine for 1 day.On second day when I was using the laptop,for some reason I restarted the laptop but it won't boot up and shut down.I switched on the laptop several times again but it won't boot up.On third day,laptop was working fine.Laptop worked fine for 5-6 days.Then I decided to reinstall windows 7 using recovery disks.When I pressed F12 to use recovery disks,after few seconds laptop switched off.It happened several times so I decided to reinstall windows using hard disk by pressing F8.Laptop switched off automatically 2-3 times after pressing f8 but one time I was able to start the recovery process.But as soon as the recovery process started,laptop switched off.After that when I switched on the laptop,it keeps on shutting down after dell logo appears.I switched on laptop many times but same thing is happening,dell logo appears,then blank screen appears for few seconds then boom,laptop switched off.Please help me regarding this!!! & sorry for the long post but I thought telling all of the above is necessary...