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[Darth Loo-knee]

My lappy is not turning on at all, no lights saying the mains are plugged in etc, the screen just stays black.....
I have checked the mains power lead and there is 20.2volts getting to the end of the little plug that goes into the laptop.

Any one with any ideas other than smashing it in will be welcome as I am toying with that option as I type

[Mr Skrunts]

I believe jamie has a tool to fix it, Think it's been nicknamed Sammy.   

[TheBoy]

Will it start if you remove battery?

[KillerWatt]

As above, remove battery and try that.

If that doesn't work, then the next thing is a CMOS reset.
Post back the make & model, and I'll dig out the procedure for that.

PS
I'd also test the power supply under load, just because it displays it's correct voltage to a meter (which is no load at all), it doesn't mean you'll have the same voltage when you apply the load (the laptop).

If a CMOS reset/battery removal doesn't cure it, and the PSU checks out OK, and the power light (the one that indicates the charger is plugged in) still refuses to light.....I'd be looking at where the power socket is soldered to the motherboard (quite a common fault).

[Darth Loo-knee]

Tried taking the battery out fella's then plugging the lappy in.. but nothing at all happens

So will the soldering be easy I am ok at soldering normal cars wires etc but not done anything tiny like I expect inside this computer

[KillerWatt]

So will the soldering be easy I am ok at soldering normal cars wires etc but not done anything tiny like I expect inside this computer

The ease of soldering will depend on your skills, and the iron you use for the job.

A £3.99 shovel rated at 50W is NOT the tool for the job (especially with multi-layer PCB's).
 

[TheBoy]

Tried taking the battery out fella's then plugging the lappy in.. but nothing at all happens

So will the soldering be easy I am ok at soldering normal cars wires etc but not done anything tiny like I expect inside this computer

Soldering may be something best left to somebody a little more experienced.  Sure there are a few people near you who can help though

[TheBoy]

That said, the power socket is normally pretty easy to resolder, assuming the tracks aren't knackered

[Darth Loo-knee]

So will I see a broken wire or something as I am going to try with My Shovel

[TheBoy]

So will I see a broken wire or something as I am going to try with My Shovel

Dry joint or cracked board near the power socket

[Darth Loo-knee]

here it goes then
stay online for Gowds Sake 

[JamesV6CDX]

My Dell recently did this.

When I took it apart, the CMOS battery seemed to be seeping a little fluid over the motherboard.

Cleaned it up with contact cleaner, left it to dry, put it together, and worked fine, no faults since 

[Darth Loo-knee]

There are a million screws holding this lappy together

[CaptainZok]

There are a million screws holding this lappy together

See how many you've got left over when it's back together.

[Vamps]

There are a million screws holding this lappy together

See how many you've got left over when it's back together.