System wont run after cleaning heat sink and fan.

[coldblood22]

I have a desktop machine with AMD Athlon 64bit 3200+ processor and MSI RS480M2-IL motherboard which i have been using for more than 3 years now.Yesterday evening i thought of cleaning my heat sink and so i removed the heat sink from the motherboard. When i removed the heat sink, the processor also got removed with it as it was stuck to the back of the heat sink. I tried to separate the processor out of the heat sink but it wont come out. So i just cleaned the heat sink and the fan over it. As i could not separate out the processor from the heat sink i placed it back into the processor socket and switched on my system. The system started running but there was no display on the monitor. So i removed the heat sink again and separated the processor out of the heat sink with some pressure. I placed the processor first and then locked it into the processor socket and then placed the heat sink over it. Even then there was no display on my monitor. I don't know what i have done wrong. Someone please guide me on this.

[Amd Athlon]

Do check for the video card that is been installed to the system. There is a possibility as you have opened the system the card may have loosened up. Fix it up properly or look for the cord that is been attached.

[coldblood22]

I don't have a separate video card. The card comes on board. So i don't think that is the issue.