Question Ram Upgrade - Now Pc doesn’t boot.

Jul 13, 2019
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Hello, I’ve recently bought 2x4 gb (Total 8 gb) 240 pin DDR3 1333 GSKILL Ram. -
https://www.newegg.com/g-skill-8gb-240-pin-ddr3-sdram/p/N82E16820231422?Item=N82E16820231422
This was to upgrade my current hp p6644y’s stock 4 gb ram.
I took installed the new ram but after powering up the pc, I get 1 short beep and 1 long beep. The monitor screen stays blank. I found out that from hp’s support site that it represents a memory problem. So I took out the new ram and replaced it with my old ram. I turned on the pc again and it was working fine.
I am now confused to wether or not the ram sticks I bought are compatible with my hp p6644y or if it’s another problem. Please help me out.

My pc: Hp p6644y
Changed specs:
CPU: Q9650
GPU: GTX 745 4gb