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HP Recommended

Hi. I have a PC Workstation HP Z620.

Pc was working fine, but sadebly just stopped working and it smells burned plastic. When i try to to switch it on, a red light beeps 4 times and won’t allow mw to start. Also, what I have notices as well is a light flashing on matherbord whe MEM FAN is written. Could the fault be the 

HP Z620 CPU 2 Fan & Heatsink. 

or is something else. How to solve this? Please help me ASAP.

Thank you in advance!

† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the <a href="https://www8.hp.com/us/en/terms-of-use.html" class="udrlinesmall">Terms of Use</a> and <a href="/t5/custom/page/page-id/hp.rulespage" class="udrlinesmall"> Rules of Participation</a>.