Cyclic reboot to complete blackout?

Question

Do it yourself

Greetings.
The trouble happened - the laptop (Acer Aspire 5520) when turned on acts as follows:
1. Turns on the power, WiFi and HDD indicators
2. Turns on the cooler
3. Judging by the sound, it initializes the CD-ROM
4. Turns off completely, after a second - go to step 1 The
behavior started quite suddenly - while surfing the net.
There is a slight suspicion that these are the consequences of overheating.
I gave it to the service, they diagnosed “malfunctions in the power supply circuit” and broke the price one and a half times higher than the cost of a new motherboard from ebay.
Who can help with the diagnosis (advice or deed - if from St. Petersburg)? If anyone has a donor laptop of a similar model, from which you can rearrange spare parts for diagnostics, I will charge a nominal fee.

Answer 1

And what is there to rearrange from the donor? The problem seems to be in the motherboard.
Try to remove everything (disk, memory, CD-ROM), if the behavior is the same, then there is nothing special to remove from the donor.
Either you need to order a motherboard on eBay (if the beech is expensive as memory), or change the entire computer.

Answer 2

SC is now lazy and will not bathe with chains. Buying mom solves the issue. Had a similar problem after pouring tea. Bought my mom.

Answer 3

1. Change the thermal paste, if not changed. I think the machine is 4 years old ...
2. If it didn’t help, NVIDIA GeForce 8600M GT is most likely to blame, they mess up on different laptops, as a result of overheating, the GPU is unsoldered, but for this, you have a hair dryer in your hands and go!

Answer 4

first try to boot from LiveCD (if CD is booted) and start from it