I've had this PC for about 2 years now from when I built it. I recently decided to clean all the dust on the inside. So I removed my heatsink from my cpu and did a good cleaning around the corners of the case and fan. I reapplied the thermal paste and removed one of the sticks of ram so I could put the clip-on fan on the heat sink. I put the ram back on and once I try to connect everything and power on the computer it turns on for a second turns back off and proceeds to repeat this cycle until I flip the switch on the back of the case. I thought it might've been something to do with the ram, so I take back out the ram I previously took out. Now, when I power it on the computer stills turns off after a second but later stays on afterwards, and everything is fine. I put the ram I took out back in and now it does they same thing of turning on then off, except it stays on for a good 30 sec before repeating the cycle. Any suggestions on what to do?