Not starting when pulling string seams to be no preasure

replace the starting pull cord Graeme, Check the attached links,instruction and guides, Good luck
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WeedEater string pull repair STRING WON RECOIL FeatherLite XT260

Fixing The Pull Cord to STIHL Weedwacker

How to Fix the Starter on Ryobi Trimmer

String Trimmer Starter Repair

you might have you coil set to close to the flywheel and the coil is not letting the flywheel spin like it is suposto sotheir for you string id to tin\ght when you hace the hood on so reagap the coil and sett it a little farther back from the flywheel by not to far back

Your String needs to be re-wound. You are almost out of string or your string has Jammed under the Motor and placing a DRAG on the Trimmer

bad carburetor. replace it and that should solve the problem

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Go back to where you got the work done if you can.If not then i would get the oil preasure checked as the low light tells me the preasure is below 8 psi and the ticking is from the lash adjustors at the tappets verifys low preasure too.

Take plug out turn blower to where plug hole is down pull starter cord many times until all fuel is out. Clean plug, install, try starting without priming or choking. If no start try priming just until you get fuel to engine. Try starting again. If this works when storing blower leave fuel cap slightly loose in very hot weather until you want to start.

The pull string is probably tangled up. There are usually vents which enable you to see into the machines pull string assembly. Loosen the fasteners and pull off the cover exposing the pull string. You can unwind and untangle and then it should recoil perfectly. If that does not work continue to dismantle the pull string assembly because you probably have a broken starter pawl which is located on the back of the pull string assembly.

Try spraying WD 40 into the pull string housing and on the string as well, the clutches may have gotten a bit seized up from the elements of dampness etc.
If it seems like it is not pulling at all...you may have a seized engine that happens over time or happens due to the wrong gas/oil mixture...shoukd be 40:1 as a rule.

there should be three or four screws to the top of the mower where the string goes, after purchasing new pull string make sure you wind the spring when you re string, so that when you put the cover back on it will be spring loaded and in proper working condition

Unscrew the 3 or 4 screws on the outside of the plate that is part of the pull string housing, there are 2 centrifugal pegs that are sticking due to trimmings getting in that area. Inspect, and clean the pegs that fly out when you pull the string. Do not oil (that will only attract more junk later), make sure they are free, and come out when you pull the string. And your problem will be solved.