Ram Memory Upgrade

I have a Dell Studio 1558 (Early 2010) and I wanted to upgrade my PC From 4 GB to 8 GB, so that I can make my laptop even more fast and fluid. My laptop is running Windows 7 Home Premium (Genuine). I ordered "Dolgix Unbuffered DDR3 8 GB Laptop (Dol8gd3so1333)"

(http://www.flipkart.com/dolgix-unbuffered-ddr3-8-gb-laptop-dol8gd3so1333/p/itme5rhwj4kkheg7?pid=RAME5RHWDV7MMA4H)

Now i removed both 2X 2GB Ram and used this 8 GB Ram in a single slot, when i tried to switch on my laptop it is not able to start. Please help.

My Current PC specs:-

1) CPU- Intel 1st Gen i5 CPU M540 @ 2.53GHz

2)RAM- 2x 2GB RAM 1333 MHz DD3

3)64-Bit Operating System

4)My BIOS version is updated.