Could use some guidance. My HP laptop will do a thermal shutdown after watching video even at 720 after about 15 minutes, after about 5 minutes, the internal fan starts ramping up, until it's really running hard, then shuts down. I power back on to a blue screen stating CPU temp is 90 degrees, I can let it cool down for a few minutes, but then resuming video it will shut down again even sooner because it's already closer to shut down temp. I have new RAM sitting in my mailbox at home (maxing out to 8G) but I'm out travelling for another month or so, but I don't know if it would help, I grabbed it for $20, so it was a no brainer for the money. My other cheap laptop at home never had an issue. This a a hardware/software refresh of a barely used older laptop I was given. Specs are:

Clean downloaded Win10 home install
500G SSD
System ModelHP Pavilion g7 Notebook PC
System Typex64-based PC
ProcessorIntel(R) Core(TM) i3 CPU       M 380  @ 2.53GHz, 2533 Mhz, 2 Core(s), 4 Logical Processor(s)
BIOS Version/DateHewlett-Packard F.04, 2/11/2011
Installed Physical Memory (RAM)4.00 GB
Total Physical Memory3.80 GB
Available Physical Memory1.00 GB
Total Virtual Memory5.20 GB
Available Virtual Memory1.58 GB
Page File Space1.39 GB

NameIntel(R) HD Graphics
PNP Device IDPCI\VEN_8086&DEV_0046&SUBSYS_166A103C&REV_02\3&11583659&0&10
Adapter TypeIntel(R) HD Graphics (Core i3), Intel Corporation compatible
Adapter DescriptionIntel(R) HD Graphics
Adapter RAM1.68 GB (1,806,620,672 bytes)
Installed Driversigdumd64.dll,igd10umd64.dll
Driver Version8.15.10.2900
INF Fileoem4.inf (iILKM0 section)
Color PlanesNot Available
Color Table Entries4294967296
Resolution1600 x 900 x 59 hertz
Bits/Pixel32
Memory Address0xB0000000-0xB03FFFFF
Memory Address0xA0000000-0xAFFFFFFF
I/O Port0x00005050-0x00005057
IRQ ChannelIRQ 4294967292
I/O Port0x000003B0-0x000003BB
I/O Port0x000003C0-0x000003DF
Memory Address0xA0000-0xBFFFF
DriverC:\WINDOWS\SYSTEM32\DRIVERS\IGDKMD64.SYS (8.15.10.2900, 11.74 MB (12,311,776 bytes), 11/27/2012 3:26 AM)

Yep every HP laptop I've ever had anything to do with did that right before it died. Been there done that learned my lesson. One did it in warranty. It died again right outside of warranty.

Have you blown the dust out?

Dust free, light use before I got it, and did a quick cleanout of what was barely there when I upgraded it to SSD and reloaded windows from a download without the HP bloatware. Runs fine otherwise for my uses, 12 second boot, just chokes on video.

You'll probably need to open up the laptop, and quite possibly remove the heatsink assembly and replace the thermal paste.  While it is open you'll also have a better view of any internal dust.

This video shows disassembly and replacement of thermal paste.

Thanks all, I will clean and redo the thermal paste, and see what happens, once I get back home from road tripping.