Comouter Won't Power On

Hi, this is my first post. Ok well basically I was going to hook my computer up to my TV downstairs and in the process of picking it up and putting it down I may have jostled it. When I found out I didn’t have all the parts that I needed to complete my project, I brought it upstairs again (Probably Jostled it then too). Well when I tried to start it back up it wouldn’t even make a sound. Nothing in the computer moved, the only thing on was the little green flashing light in the back of my power supply. So I contacted Hp and after about a half an hour they told me it was something on my motherboard. So I spent about 4 hrs reading things online and taking out parts. I took out all my pci cards, memory, and HD. Still won’t work! I tried taking out the little watch battery on the motherboard, no luck. Checked all of my connections, nothing is loose. Looked for burnt parts, none (May I remind you that It worked before, and I did not turn it on in the time between turning it off and going downstairs and upstairs so nothing could have burnt out-right?)

I don’t rly know my specks other than I have 2 gigs of ram- new
And my computer is an hp pavilion a545c

PLEASE HELP ME FIX THIS, I LOVE MY COMPUTER!!!
 
Does the power supply have a on-off rocker switch on the back? Is it on?
 
It seems like a coincidence but that aside, perhaps the power supply chose that moment (or partly as a result of the jostling) to go south. Do you have another power supply you can test with?
 
I'm a little confused. I thought you were asking for other possibilities. If you believe it is the motherboard as HP said, what is the purpose of this thread?
 
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