I have a Dell Inspion N5010 series laptop. I recently installed Windows 8. I have also Ubuntu 14.04 installed along with Windows 8 (Dual boot) ( I have been using Ubuntu alongside windows 7 for the last 2 years). After just one day of installing windows 8, suddenly my computer became very slow. I researched and found that partition D: of windows had an unclean file system. So ubuntu as well as windows 8 were unable to mount it. Due to this unclean file system, ubuntu refused to start up, but windows 8 used to start up in a very very slow manner. Even when windows 8 started, I was unable to access D: drive. So I decided to format D: drive. When I formatted it, windows showed that it was unable to properly format it. So I booted in ubuntu with a live USB and formatted D: to NTFS and cleaned everything there. Things looked just fine, but when I restarted neither Windows 8 or installed ubuntu were able to boot. So then I booted my laptop with a live DVD of windows 7, again fomatted the D: partiton though this formatting task was slower than the usual. I tried to delete all the ubuntu partitions there as ubuntu was not working at all. But when I tried to delete the ubuntu partition, my laptop became slowest I guess and it was not deleting, my lappie was very busy, the blue circle just kept moving infinitely with no result. Being frustrated, I switched off my laptop forcefully by long pressing the power button.
After this incident my laptop became unable to boot from hard disk, from CD/DVD as well as fom USB also :( .. Now when I start my laptop, it stalls just showing the Dell logo. No further processing. The initial screen having the Dell logo persists. The progress bar doesn't run. Pressing F2 o F12 doesn't do anything. I removed and replaced the battery also but with no effect.
I am unable to figure out the problem. Any kind of help would be appreciated.