Laptop keeps turning off after 3 seconds with a clink sound

[Leonaki]

Hello,

i m using a Sony Vaio SVE1512C6E laptop, it was working just fine until this morning. When i turn it on, i get the black screen with the VAIO logo and within 3 seconds it turns off by itself after making a clink sound. After that happens i 'm not able to turn it back on unless if i remove the battery. Any ideas on what problem it may have or what can i do to fix it ?

Thanks in advance..