It'll need a recap even if they aren't leaking yet, they're a ticking time bomb and might be bad despite not leaking. You're also going to want to pull the battery if you haven't, they're prone to leaking. Despite the speaker not working, do you get anything out the headphone jack?

If you can, try and track down something like a Dell 1704 or 1708 or SE198WFP or any Dell monitor for the most part. They're almost given away anymore and have no problems with Mac signals (even 1152x882 sync-on-green).