Red light near the PMU button

Hi, my iMac it's a G4 with 1.25GHz and gfFX5200.
It makes began to give problems with Kernel Panic. I have replaced the HDD and reset the PMU but it has not worked. Informing to me better I discover that the problem was given from inner RAM and I replace it. I startup the mac, the screen with the apple still and I shutdown from the power button. From that moment when I startup I find black monitor and a red light beside PMU button. Opening I have removed the thermal paste of the metal body and fear has overheated something. I have tried to replace RAM and HDD whit original and controlled that all she was connected well.
What means the red light? There is some way to save it?
PS: excused for my bad English, are Italian.

Ksola99, welcome to the forum.
The beeping that you are hearing is known as BIOS beep codes. They are to alert you to problems. Here is a guide to help you troubleshoot the problem:
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&dlc=en&docname=bph07107
There are codes near the bottom of the page. You should count the beeps and compare them to the charts to determine the problem.
Please click "Accept as Solution" if your problem is solved.
Signature:
HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
HP 10 Plus; Android-Kit Kat; 1.0 GHz Allwinner A31 ARM Cortex A7 Quad Core Processor ; 2GB RAM Memory Long: 2 GB DDR3L SDRAM (1600MHz); 16GB disable eMMC 16GB v4.51
HP Omen; i7-4710QH; 8 GB memory; 256 GB San Disk SSD; Win 8.1
HP Photosmart 7520 AIO
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**Click the Thumbs Up+ to say 'Thanks' and the 'Accept as Solution' if I have solved your problem.**
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Red light near the PMU button

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