Laptop won't start after cleaning and applying new thermal paste

Just my two cents on this matter.

Depending on the processor or your laptop model, you may run hotter or cooler... I know, pretty duh!, but for a core i5 it's kinda fair temperatures the one's you are getting. The first thing is to see if your laptop case is thin or not, that can make it run hotter.

Personally, I see those temps kinda fair... also depending on which is your power plan. Many people say that using high performance on laptops help on sppeding up things, reality is that you only get unnessesary overheating because of the PC using full power without rest. If you use a high performance plan, I would suggest to going back to balanced plan, as it will save energy and prevent heat if the system is idle, or, if the tasks aren't that demanding. High performance is only suited for desktops (at least I think that, desktops get more chances to run cooler).

I just say this based on my experience... I ignore if this had something to do when I had to take my laptop to get a VGA reballing (probably, it did). Now, this days, my CPU is running at 45° C when idle, and 75° - 77° C when running at full throttle (that means, running between 75% to 100% of CPU load) and I woudn't take that as a measure, since the first main difference is that I got an AMD CPU, which are supposed to run hotter than an Intel setup. The thing is that, mixing a balanced plan with removing dust from your laptop may give you better temps, but that also depends on the CPU architecture. IIRC, i5's are supposed to have a 45W TDP (or 35... probably), so that may give you those temps considering the speed.

Probably someone that has the same exact model of laptop can tell if your temps are normal or not, for me, depending on your power plan and internal space, look kinda normal.

Again, just my two cents, I'm not an expert or anything, in fact, the people posting here have helped me a lot in many stuff

This is all a bunch of BS! Why are you referencing CPUs that don't apply here? That just obfuscates this issue. The OP has a Core i5-2450M.

Just my say I think we could discuss matters on this forum without resorting to arguing the toss like this and I for one object to using phrases that some may find rather offensive.

I did post my views in post #17 and after having a few Toshibas what I stated was rather par for the course re temps anyway. What I want to know is did the OP do as I asked as I can find not reply because we seem to be bogged down with compounds ad nauseum that we apply when one would never know what compounds Intel would have applied inside the device and lets face it the heatsink (lid) has a much greater surface area then the actual silicon chip and I think that it is asking a lot of the heatsink to dissipate what heat the chip produces including any graphical effects.

The whole subject of how to cool CPU's has over the years I have been on this forum has been done to death re members personal preferences and not enough time in relation has been spent on how well the machine is vented and in laptops this is to me a very underrated issue which the manufacturers should address.