Windows not starting!!!

hey guys!!!

u wont believe it... i just switched on my pc... n m on my pc... working like always.. wats this goin on... i got so much scolding from my parents for burning up a gpu.. n now its working smooth... wats wrong??? whateva be the coz... i'm lovng it...
 

My Computer

OS
windows 7 ultimate x64
CPU
Intel Quad Core 2.83Ghz
Motherboard
Intel P45SG
Memory
4 GB DDR3
Graphics Card(s)
Nvidia 9800GT
Monitor(s) Displays
Dell 19"
Screen Resolution
1440x900
Hard Drives
WD 1TB
SAMSUNG 500 GB
Internet Speed
512 KBPS
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