Computer Booting Cycle

Hi ,

Recently , i ve been having a problem with my computer .
The Problem is whenever i move it to another place or even the slightest shaking of my table stops it from working .
When it does that , i open it it boots nothing pops on screen the lights on all fans are on then after about 3-5 sec it shuts down and goes on a cycle of rebooting .
i always get to fix this problem by taking the pc playing with some wires in it or removing and putting back the parts but the problem this time seems to be really serious it has been on this case since 1 week usually i fix it within 1 hour . i searched forums for this problem but no solution worked . And By the way there are no bips .