If there is no chime, that means the computer failed the Power-On Self Test (POST). You could try holding down the option key and see if that gives any options for start up drives. If that doesn't work, try CMD+R. If the computer can, it will boot into Internet Recovery. From there you can use disk utility to check your hard drive and reinstall an OS if needed. I am a little concerned by your comment "I tried to upgrade the firmware but that did not work". If your firmware is messed up, you can try following the directions at [https://support.apple.com/en-us/HT201692|this link].
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If there is no chime, that means the computer failed the Power-On Self Test (POST).
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You could try holding down the option key and see if that gives any options for start up drives. If that doesn't work, try CMD+R. If the computer can, it will boot into Internet Recovery.
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From there you can use disk utility to check your hard drive and reinstall an OS if needed. I am a little concerned by your comment "I tried to upgrade the firmware but that did not work".
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If your firmware is messed up, you can try following the directions here [https://support.apple.com/en-us/HT201692|About the Firmware Restoration CD (Intel-based Macs)]
If there is no chime, that means the computer failed the Power-On Self Test (POST). You could try holding down the option key and see if that gives any options for start up drives. If that doesn't work, try CMD+R. If the computer can, it will boot into Internet Recovery. From there you can use disk utility to check your hard drive and reinstall an OS if needed. I am a little concerned by your comment "I tried to upgrade the firmware but that did not work". If your firmware is messed up, you can try following the directions at [https://support.apple.com/en-us/HT201692|this link].