Did you try booting the thing from CD or FireWire or anything? Could just be a corrupted installation or a bad hard drive. I would've checked those first.
As for capacitors, yes, there are a few on there. In fact, more than a few. However, there aren't all that many electrolytics compared to a desktop or anything; most electrolytics are in the power brick for notebooks, though there are a few for power filtering, and the iBooks use a large one for retaining date and time during a quick battery change (though not if the computer's in sleep mode).
No, most of the caps on those are usually ceramic or possibly tantalum, and are generally very, very small. Most Macs (like many other products) label their capacitors with C and a number, such as C143. So, most components on your board labeled like that are probably capacitors. Since ceramic and tantalum capacitors rarely die before a few decades have passed, and since there are undoubtedly 100 or so on the average board, it'll be more trouble than it's worth to try to replace them.
As for capacitors, yes, there are a few on there. In fact, more than a few. However, there aren't all that many electrolytics compared to a desktop or anything; most electrolytics are in the power brick for notebooks, though there are a few for power filtering, and the iBooks use a large one for retaining date and time during a quick battery change (though not if the computer's in sleep mode).
No, most of the caps on those are usually ceramic or possibly tantalum, and are generally very, very small. Most Macs (like many other products) label their capacitors with C and a number, such as C143. So, most components on your board labeled like that are probably capacitors. Since ceramic and tantalum capacitors rarely die before a few decades have passed, and since there are undoubtedly 100 or so on the average board, it'll be more trouble than it's worth to try to replace them.