Originally Posted by jhelsdon
Usually is you get power light for a second or two, but the system wont enter into boot screen, then the issue is bad ram. It does not mean this is the only possible cause. There is the possibility that the system board, the CPU, or even the battery are damaged and are effecting the system start up process.
If the system was overheating prior to this symptom, there is a good chance the system board or CPU are damaged.
Interesting... A week ago my trusted Precision M60 started doing the same thing. Hitting the power button would elicit a high-pitched electrical whine, the CAPS LOCK, NUM LOCK, SCROLL LOCK lights would flash, and then it would die. I found removing the hard drive would get the system to power on at times. Holding it in weird angles seemed to work too. Pressure on the left side of the system worked as well. It would boot into Windows but then it would freeze solid. I disassembled the entire system, reseated the CPU, reseated the RAM, etc. but no dice. No change. Now it doesn't even that anymore.
It was an 8 year old system so I just ordered a new laptop. Googling around I saw several older Dell laptops going through the same issue. What cracks me up is that I have two very old Inspiron 3700 and Inspiron 4000 laptops (older than even the M60) that still work just fine. Anyway, I don't mean to threadjack but I'll be following your progress closely to see if you guys come up with something I haven't thought of so far.