Whoa, this thread is scary.
Basic safety procedures apply
1. If not competent to work on live mains power supplies...don't ....The Darwin effect will potentially cost you your life
2. Never, ever just bypass a fuse. It is in circuit for a very good reason. If it fails, it failed for a reason that should be investigated.
3. Always check the input to the SMPSU for low resistance.If such is present, connecting it to the mains with a new fuse serves no purpose !
4. If a low resistance exists across the input to a SMPSU you should start checking the input components for failure with the multimeter until the cause is found and rectified. Be careful with the high voltage primary side capacitor as it may be charged to almost 400V (on 240V supplies). It hurts if you get across it !
5. If the input does not appear to have a low resistance across it, fit a new fuse of the correct currret rating and connect a 240V 25W incandescent light bulb in series with the live supply line feeding the SMPSU. The lamp provides some protection if excess current is drawn. Fit some dummy loads on the outputs. Suitable resistors or light bulbs will do.
6. If the SMPSU is switched on and does not illuminate the light bulb the outlook is good. Check for correct output voltages on the SMPSU. If present and correct, remove the light bulb from the supply circuit and see if the SMPSU functions normally with some dummy loads on the outputs. If not, you need to investigate the output stages of the SMPSU for faults. The smoothing capacitors should always be considered suspect unless proven otherwise.
7. If the SMPSU works correctly during testing, there is the possibility of a fault causing high current draw from the SMPSU when it is powering its intended load. This should be investigated.
This is a generic and somewhat simplified decription of how to approach a faulty power supply. It is not specific to your case. In your case, high current was drawn when the fuse was by-passed. That cold be a failed (low resistance) MOV across the supply rails, a failed rectifier, failed switching transistor or significant low resistance failure in the seconday circuit drawing excess current.
You should always do as many quick checks on a SMPSU as possible without power connected. It tends to avoid electrocution and burn-ups !
Fraser