Inspiron 5150 Startup Problem

I have had a Inspiron 5150 for about 3-4 years now. My problem is that when I go to turn it on, it barely begins to engage startup before dying. A couple of times I got lucky and it booted up, but then just shuts off. a) When I turn on the computer running under battery power only, the battery light (amber colored) flashes for awhile then stops. b) When starting the computer with the power cord plugged in, the Green power light comes on, then flashes awhile, then stops. I really don't think it is the battery because I have two batteries and have tried them both and it does the same thing when plugged in. Any suggestions as to what is wrong? I'm stumped. Here are some of my specs (sorry, it's all I could find): 1 3U722 BEZEL, FEET, PLASTIC, LIQUID CRYSTAL DISPLAY, 15.0, ABACUS 1 J1838 LIQUID CRYSTAL DISPLAY, SUPER EXTENDED GRAPHICS ARRAY PLUS, STANDARD PANELS WORKING GROUP, 15, IDT 1 G1278 PROCESSOR, 80532, 3.06G, 512K, FLIP CLIP PIN GRID ARRAY 1 D0093 BATTERY, MALAYSIA DIRECT SHIP, 14.8V, 12C, LITHIUM, PANASONIC 1 7T249 BATTERY, SECOND, 14.8V, 12C, LITHIUM, SONY 1 Y1871 CARD (CIRCUIT), GRAPHICS, NVIDIA, 32M, NV34, 5150 1 1T707 HARD DRIVE, 30G, I, 9.5MM, 4.2K, TSHBA-NEPT 1 6G647 DUAL IN-LINE MEMORY MODULE, 128, 333, 16X64, 8K, 200 1 6G648 DUAL IN-LINE MEMORY MODULE, 256, 333, 32X64, 8K, 200 1 N2133 SUBASSEMBLY, Digital Video Disk Drive Read Write, 4X, HITACHI LG DATA STORAGE, ABACUS If there is any other specs that I missed, let me know. Thanks for any help in advance. Ken