need help with non powering laptop

[viper650]

i just took this compaq presario 2100 laptop apart. i was going to put a 2.4ghz P4 in to replace the celeron 1.8. turns out the celeron has no IHS and the p4 does so it wouldnt fit. now, when i put the computer back together, it wont boot... at all. wont even power on. can anyone advise me on what could be wrong? i tripple checked everything, and it just wont boot. i really dont want to have to buy another one and then swap the HD's out, but if i must then i will. i need to fix this by sunday. any advice?

[nn_step]

double check all the connections and please for the love of god tell me that you used ESD protection when working on it..

[viper650]

double check all the connections and please for the love of god tell me that you used ESD protection when working on it..

EDIT: i thought about it when i woke up this morning, and i pushed the reset button... it booted right up. everything works fine now. ugh. im so glad its ok.

always discharge any static elec. before i work on anything electrical. plus, the computer was on a glass table, and i touched something metal before. i dont know what other connections to check? i checked the cpu was in all the way, it is. the monitor screen was connected, the heatsink fan was connected, two ribbons connected, keyboard and another. i got it to turn on one time, but it kept just clicking and restarting after about 1.5 seconds. very strange, im going to have to take it to a repair shop tomorrow, i dont want to but i think its the only thing thats going to fix it. i dont know much about laptops, other then i dont like them much for this very reason