I have an Alienware Aurora R4 that I have had for a number of years.  I have not run it for while and I tried to boot it up this week and it won't boot.  It starts to power up, exercises the top cooling slats and power back down.  It has been used very little and has been sitting for quite some time, could I have an issue with the CPU Liquid Cooling system?  Dell does not seem to have a Power ON Set of LEDs like they have on most of the mainstream desktop PCs that can give you some idea of what the problem is during boot up.

I tried the suggestion I found on this Message Board about checking and removing the CMOS Battery but that had no effect.  Any ideas or troubleshooting help would be greatly appreciated.  I called Dell, but my extended warranty on this box lapsed 2 years ago and they won't even help if I offer to pay for support on a PC this old.