Can't find cause of beep problem

[aabipu]

Recently, I'm having a problem in my pc. Sometimes, when restart my pc cause sound like ( beep-beep pause beep-beep cont... ) with no screen. But amazingly after removing all back pc cables and resetting them sometimes pc works normally. Sometimes this method don't work. Then I open the pc case and stay sometimes, then close the case and plug the pc. Then it works normally again. This problem is happening randomly, and either two method I have to apply each time. I'm now planning to change problematic part of my pc. My question is, what should I change, GPU, Casing, MOBO, Powersupply or anything else ? As, my MOBO is Intel DH55PJ, according to Intel the beep code I'm having means 'no video', but it's suspicious because, sometimes I just don't do anything and let my pc off for sometimes and then it works normally. I'm confused, what is problematic ? Is this a heat issue ? But, I don't find my GPU very hot anytime. And this not happen when I'm running my pc even for several hours with gaming. This just happen sometimes during restart or start after shut down. plz help.

sorry for my poor English.

My PC spec

CPU- Intel Core i7 870
MOBO- Intel DH55PJ
Power Supply- Space 440w
GPU- nVidia GT 9500 DDR2 512mb
HDD- 1TB Samsung

Thanks for any reply in advance.

 

[mosox]

Try reseating the video card in the slot.

 

[aabipu]

I also try this, temporarily that works, but the problem then back again, should I change my MOBO ? Is this a problem of my GPU slot ?

 

[ram1009]

Try using a pink or green pencil erased on the gold fingers of your video card where they plug into the MB connector. Pencil erasers are the best for cleaning electrical contacts. Be sure to remove any crumbs.

 

[aabipu]

I'll try ram1009 method, but I don't think it's a dust prob. coz, I clean it up regular basis, and sometimes I just do nothing, but just off my pc for several minutes, the problem disappears, this cause me think that it's a heat issue. I am a bit confused though.... coz the problem also sometimes happen when start pc after a long time.