PC shuts on and off repeatedly(won't boot)

[Milan_Cvijovic]

Hello,
I have an old PC with 2gb ram and 512mb vram graphics card(windows 7 - 32 bit),very old parts in general…It worked fine over the years until last year around september i tried to boot it up, after 5 seconds it turns off then on and that would repeat until i turn it off…I didn’t have a clue whats going on, looked it up on google, found some stuff about it and bought a thermal paste.Replaced the paste on the cpu and gpu and put everything back and it worked until yesterday, the same problem appeared again and i dont know what to do(should i replace the paste again?).Screen says no signal and when i take out the gpu the cpu doesnt turn off…Whats the problem, what should I do?

*Screen says no signal and when i take out the gpu the PC doesnt turn off.

[phillpower2]

Overheating and a weak power supply come to mind.

Please provide information about your computer, is it a custom build or brand name such as Dell or HP, if a brand name, provide the model name or series number (not serial) if a custom build post the brand and model name or number for the CPU, MB, the RAM (including the amount) add on video card if one is used and the PSU (power supply unit) providing these details will enable folk to better assist you.

[Milan_Cvijovic]

Graphics card actually has 256mb ram

MOTHERBOARD: MSI H61M-P20 (G3)
CPU: dont know exactly its celeron with around 2.4-2.8GHz, dual core, 32-bit
RAM: Silicon Power SP002GBLTU133V02 DDR3 1333MHz, one stick
GPU: NVidia Geforce 8600 GTS
PSU: Rhino RX-500PA

[phillpower2]

PSU: Rhino RX-500PA

That has got to be the worst PSU that I have ever seen, even the information label on it says that it can only produce 168W, how the computer has ever worked using that is a miracle, see attachment below.

MOTHERBOARD: MSI H61M-P20 (G3)
CPU: dont know exactly its celeron with around 2.4-2.8GHz, dual core, 32-bit

The MB can only provide video if the CPU does and being that we don`t know what the CPU is we have no way of checking the specs, any onboard video uses the RAM for support so bad RAM would stop you getting video via the CPU if your CPU does have it.

Only thing that you can do atm is get a known good power supply, a minimum of 350W Bronze rated with at least 24 amps on the +12V rail when testing with the GPU in the board and with the GPU completely removed from the board a 300W Bronze will do.

I suggest that you remove the GPU from the MB and store it somewhere safe while you check for any onboard video.

[Milan_Cvijovic]

I think cpu isnt the problem if it worked fine for this long, havent touched it just changed the paste

[phillpower2]

Not sure of the reason for your reply as I have advised you what you need to do and nowhere was it suggested that your CPU was bad.

As per my reply #4;

Only thing that you can do atm is get a known good power supply, a minimum of 350W Bronze rated with at least 24 amps on the +12V rail when testing with the GPU in the board and with the GPU completely removed from the board a 300W Bronze will do.

Fwiw: The No Signal message is telling you that the screen is ok and that the problem is with the source of the video or the cable that is carrying the video signal, the GPU, and RAM could both be bad but if they are the damage will have been caused by that awful PSU.

[Milan_Cvijovic]

Could i get away with any of these:

https://gigatron.rs/napajanja/stars-solution-napajanje-570w-364431

https://gigatron.rs/napajanja/ms-industrial-napajanje-ms500-84979

https://gigatron.rs/napajanja/mission-q-napajanje-400w-148639

Its not on English but i think you can understand the specs.

[phillpower2]

No and before making any purchase it is advisable to see if you can borrow a PSU or get the PC checked by a local tech, as mentioned in my reply #6 the previous PSU could have damaged one or more components and we don`t want you spending money if it will not get you up and running again.

From your links;

Feedback for the first PSU says;
Negative impressions

It comes without a box, only in foil, so it is a bit unsafe for transport. The specification says that it has a 4 + 4 pin connector for the processor, which is not the case. It has only a 4 pin processor connector, as well as other power supplies in that price range.

The second PSU specs do not tell you how many amps the PSU can produce so you cannot work out the true power output, it also has a floppy disk connector and no one has used them for years, old. cheap and low spec = no good.

The third PSU, labelled as 400W but can only produce 300W which is not enough for your GPU should it still be working.

None of the PSUs are even 80+ let alone Bronze efficiency rated, we appreciate that it may be difficult for you to be able to find and pay for the appropriate PSU but the last thing that we want you to do is spend cash only to end up being disappointed.

[Milan_Cvijovic]

Thanks a lot, you can close this thread now

[phillpower2]

You are welcome and good luck (y)