Laptop (Toshiba and Acer) hilariously, both same issue

Hi Guys hope you can help me on my happy problem...
Got Toshiba Sat Pro and Acer Aspire, both having the following issue:

With/without battery

*Shuts down seconds after turned-on, and sometimes it arrives at Windows 7 logo and desktop but still unfortunate.

Tried doing these fixes but still unfortunate.

1. Clean fan.
2. Put new thermal paste
3. Reimage (still shuts down, so not resolved)
4. Replaced HDD
5. Interchange RAMs (checked thoroughly and cleaned)

But here's the confusing thing, when I tried backing-up the files using "Hirens - Windows XP", it does not shut down.....waaaaaaaaaaaaaaaaaaaa!!!!

Please help...Thanks and more power to TechSpot!!!!
God bless you guys!
 
Hi,

Thanks for your interest in answering my query.

Tried resetting the BIOS before but no luck.
I've consulted my laptop to some laptop expert?? but they figured that my PS is the problem, it can't handle Core2Duo (Centrino 2) processor, they said, they tried using P4 processor and it doesn't shutdown but no display.

Tried doing this:

1. Replaced harddisk, first run in BIOS (Idle at BIOS for 20 mins) it doesn't shut down.
2. After the bios, I booted until desktop successfully loaded, lasts until 30 mins or more, I just shut it down to check with the original HDD.
3. Boot normally with original HDD, auto run of Chkdsk, and then it "shuts down" not restart.
4. Now, I'm trying to idle again at BIOS with the original HDD, and it's not shutting down, it's about 5 mins now.
5. Hopefully, there's a good news for this for your answer on this.

Thank you very much!

Please help...Thanks and more power to TechSpot!!!!
God bless you guys!
 
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