Baked laptop for dinner - what temperature?

So here is the situation: I bought this laptop on e-bay as non working looking to use screen from it in to another laptop. When it arrived I tried switching it on before ripping to pieces and it worked. Soon I realised that it has interminent problem where it sometimes switches on and sometimes it does not as well it might switch off when it likes. It can be made to switch off buy bending it or if it does not switch on it can be made to switch on by flexing it in the right bottom corner. Obviously it has loose/dry joint somewhere. Instead of checking all of the joints and resoldering I thought I could take the motherboard and bake it in the oven to melt loose joints together pretty much like it is done when manufacturing.

The question is what temperature to use and how long to bake it? I have been trying to search the net on motherboard manufacturing and while there is lot of results on manufacturing I could not find anything about temp. The solder used probably has melting point somwhere 12-180 C so I would need to use a bit higher I was thinking 220-240C looking to use higher temp and shorter time like 2 min because don't want ot make plastics melt or caps to pop.

If anybody has slightest idea please let me know. And this is experiment so I will not be sorry if it does not work out afterall it was bought for a screen and I will still have a working screen if I frie motherboard but if I can make it all work - why not? - I can always get another screen for that laptop.

Iam looking to proceed with baking tonight or tomorrow at latest. So If You can give me your best advice,please do and I will let everybody know how it worked out.

At this point I am going for 240C and 2 min unless somebody gives me better advice.

Only camera I have is in the phone and flash is not working anymore but I will see what I can do.