My Packard Bell laptop starts for a few seconds then shuts down then repeats this untill power removed

[Scorpion2321]

Hi guys, Got a bit of a problem with my laptop first of all here are the specs
Packard Bell EasyNote_ts_11 hr_244pt


ntel Core i5-2410m
nVidia Geforce GT540M
4Gb DDR3 (2x2Gb)
samsung 850 evo 120 gb
Ecrã 15,6" HD LED
Intel HD Graphics

Whats happening is that if I turn the laptop on (battery out just AC) then its turns on and in 2 seconds turns off and repeats untill the AC is unplugged(sometimes it doesnt happens). I tried booting with just the battery and I have the same issue apart from it don't repeat just happens once and stays off. After looking online for a while I've taken out RAM and inserted just one at a time to see if issue was resolved. No change happened (and i did a memtest and both rams were fine ). I can see the CPU fan spinning when the laptop is first turned on. Sometimes it goes to windows and i can play games for like 2 hours and sundendly the pc shutdowns.
i have also checked the temperatures at iddle mode (40-50º) and gamming (just cs go it reaches 77º)

So I'm wondering if there is any way of trying to fix this issue or is a new motherboard what i need and how easy is it to replace one if so?
If you can help I'd be very grateful Thanks
Please Help Guys


some pictures of my pc
http/i.imgur.com/o3HSokY.jpg
http/i.imgur.com/keFztQR.jpg
http/i.imgur.com/D1O29Rj.jpg
http/i.imgur.com/m3rjCgc.jpg

 

[Scorpion2321]

any1 can help me?

 

[Scorpion2321]

pls some1?

 

[PCristianUK]

Hi from how long you have the laptop ? May be the power jack try to pull out all the connection and put one at the time Like motherboard and lcd ...without ram is doing post ram missing bips or blinking .se if the fan work leve for 10 -20 min . If is do not shutdowns try put the ram and leave for other 20 min on if is not shutdown connect hdd and do the same for wi fi and see ...may be a connection of a hardware is if still work is the cmos battery but is better to check everything....my dell is do the seam after i replace the cmos is start work normal