Pc wont post and gives no video signal

[greilaboncz]

I recently bought a used pc. The specs are:
I5 2400
Radeon R7 240
2x2Gb Ram
Lenovo ih61m mobo
120Gb OCZ SSD
240W psu
The pc worked fine until today. When I tried to turn it on it came up with the mesage "No operation system found"
I took the pc apart to see if the ssd is still connected. It was. So i restarted the pc but it didnt gave me video signal. After 10 sec. it turned itself off. The pc wont boot. All the fans are spinning at max speed. After 10 sec the whole system turns off.
I tried using the internal gpu with no result. (The r7 240 works). I tried an other psu and still got nothing. I tried reseting the bios by takeing the battery out for 1 hour and puting it back. This didnt work. I've changed the heatsink compound on the cpu. This didnt helped either. Ive tried only one stick of memory . I noticed that if i turn it on with no memory it beeps.(short-srt-srt-long)
I would really apreciate your help / suggestion!

 

[Obakasama]

Hopefully someone can chime in too....

First thought was a hard drive failure. Whether it's the SSD itself, the connection or even the SATA port. Have you got another hard drive to test?

Not sure about the beep code you mention. Is that 3 short beeps and 1 long? I couldn't see that on Lenovo's page: https://support.lenovo.com/gb/en/solutions/ht062270

Sounds like you've tried a few things already, but for completeness see if there's anything in the POST sticky which you haven't tried: http://www.tomshardware.co.uk/forum/261145-31-perform-steps-posting-post-boot-video-problems

 

[greilaboncz]

I cheked the SSD in another pc and it works.
I also cheked the link you sent. (With the no post suggestions).

I have an other hdd but i cant do anything because i cant get to bios. It wont display anything. The thing with the "no operation system" was only visible when the whole pc started not working. Since then its not giving any video signal.

I know that its not a display connection error. It shouldn't shut down after 10 sec.

Anyway thanks for your suggestion.

 

[greilaboncz]

I forgot: (without RAM) the pc beeps. 3short -1long . Its repeating the 3short 1long pattern until i turn it off.
The ram sticks might be faulty?