Hi there. This is my first post on the MacRumors forums. So the problem is I got this Mac Mini from eBay a couple of days ago which I took the risk of upgrading the CPU from a 1.83 GHZ Intel Core 2 Duo processor to a 2.0 GHZ T7200 Intel Core 2 Duo processor. I followed the online guides carefully and upgraded the CPU. During this time, I took the time to dust out everything with a compressed air can. I removed the RAM chips and everything. Now, I put it back together and I only get the white light indicating its on. But I have no chime, no Apple logo or anything. The screen stays black. With this problem, i've looked online for various solutions like resetting the PRAM and resetting the SMC and all that but still, no luck unfortunately. I've opened the machine reseated the RAM chips and even the CPU itself. Checked all the connections and everything is good. I did manage to break the Airport WiFi antenna... (stupid me the cable just broke off ). I ordered a new one on eBay because that since I'll be using the WiFi on this machine a lot. But I don't think that would affect the boot up process or cause anything like this problem. I'm out of suggestions and need some advice on how to get this little machine back on track. Any help is appreciated! -Thank you!!