random restarts & black screens

Happened again but it had been on all day with out the cooling pad, is there anyway to prove via windows that it's overheating. Tried programs that tell you the temp but it's usually at about 40c, is that too hot? i've been told it isn't. Could it be the graphics card?
 

My Computer My Computer

Computer Manufacturer/Model Number
Compal Cantiga
OS
Windows 7
CPU
Intel(R)Core 2 Duo CPU P8700 @ 2.53GHz
Motherboard
KHLB2
Memory
4.00GB
Graphics Card(s)
ATI Mobility Radeon HD 4650
Sound Card
Realtek HD Audio & Ati HDMI Audio
Monitor(s) Displays
Genric Display
Hard Drives
Hitachi HTS723225L9A360 ATA Device
Case
Cantiga
I've installed speed fan. Going to try it with out the cooling deck for the rest of today.
 

My Computer My Computer

Computer Manufacturer/Model Number
Compal Cantiga
OS
Windows 7
CPU
Intel(R)Core 2 Duo CPU P8700 @ 2.53GHz
Motherboard
KHLB2
Memory
4.00GB
Graphics Card(s)
ATI Mobility Radeon HD 4650
Sound Card
Realtek HD Audio & Ati HDMI Audio
Monitor(s) Displays
Genric Display
Hard Drives
Hitachi HTS723225L9A360 ATA Device
Case
Cantiga
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