I recently picked up a Grid 286 model 1520. when I plug it in (the 3 prong PSU) and hit the power switch the lower/external disk drive and battery charging/low lights blink and then nothing. Two of the many times I've tried to power it on it did start to boot and then shut off after a few seconds. I tried ejecting and reinserting the PSU but no luck. I've also left it plugged in for several hours but the same. I'm guessing the battery/PSU is dead but I have zero experience with this machine and laptops/portables in general. any advice on this thing? will I need to somehow replace the PSU (which I guess will not be easy or cheap)? also whats the standard power jack next to the 3 prong power plug? it looks like it takes a standard laptop charger.