Once they completely fail, then yes I agree, but leading up to that
http://forum.lowyat.net/topic/341368
Symptoms
The most common method of identifying capacitors which have failed because
of bad electrolyte is visual inspection. Such a capacitor will show one or
more of these symptoms:
* Bulging of the vent on the top of the capacitor
* Sitting crooked on the circuit board as the bottom rubber plug is
pushed out
* Electrolyte (a crusty brown substance) leaked onto the motherboard
from the base of the capacitor
* Venting from the top of the capacitor, visible as rust-like brown
deposits, or a visible hole in the vent
As the capacitor ages, its capacitance decreases while its equivalent
series resistance (ESR) increases. When this happens, the capacitors no
longer adequately serve their purpose of filtering the direct current
voltages on the motherboard, and system instability results. Some common
symptoms are:
* Not turning on all the time; having to hit reset or try turning the
computer on again
* Instabilities (hangs, BSODs, kernel panics, etc.), especially when
symptoms get progressively more frequent over time
* Vcore or other system voltages fluctuating or going out of range,
possibly with an increase in CPU temperature as the core voltage rises
* Memory errors, especially ones that get more frequent with time
* Spontaneous reboots
* In case of onboard video cards, unstable image in some video modes
* Failing to complete the POST, or rebooting before it is completed
* Never starting the POST; fans spin but the system appears dead