MacBook (a1181) various boot issues

(powers on but does not chime or boot to OS after previously working. history and details below)

I am trying to help someone with their computer issue. It is a mid-2009 Macbook 5,2. It came to be as a non-booting machine. I went through various steps and finally was able to get it to boot by holding down power button, plugging in magsafe, keeping power button held down for 15 seconds, releasing, and then powering on. All this without battery installed.

It booted into OS X. The disk was verified. I was able to re-boot a few times. I re-installed the battery to try and charge it. I came back to it and had the same booting problems. Did the same thing to re-boot it and it came back no problem. With and without battery installed. However, System Profiler and coconut battery were unable to identify the battery.

I went to re-boot it again a short time after installing coconut battery and now it will power on but will not boot to OS X. No chime. Nothing but fan noise.

I've tried re-seating RAM, swapping RAM, PRAM, opened it up and not seen any visual defects or corrosion, along with various other steps. Any further thoughts would be much appreciated.

****EDIT

I tried the Add Comment function but it did not work at the time.

It seems if left alone for a stretch of time the machine will boot if using the same method as described above. I assume that it is bypassing the SMC as the battery is not recognized and the fan goes full blast. I also am assuming this issue is an SMC issue as any other time that it boots it just powers on but doesn't show a status light, chime, or anything on the display.

Are there any SMC "fixes" or repairs I can move on to?