Optiplex 760 buzzing alarm

6 beeps 1 1 4 is  ROM BIOS checksum error.

https://www.dell.com/support/kbdoc/en-us/000124830

760 is well past end of life end of support being over 10 years old.

Linux is not supported on ANY dell if it did not ship with Linux from dell.

If nothing helps the buzz and boot, can consider replacing the mobo.  760MT mobo is about $15 free shipping on ebay in US.  otoh, if the plan to keep 760 is just to use the photo app, can transplant hdd w the app to another working desktop pc.  Win 10 usually boots after adjusting to recipient pc hardware.

Thanks for your reply, and a supply of the CR2032 batteries is expected very soon. I jumpered the RTCRST pins after removing the current battery, only months old. I also tried jumpering the 2 pins one inch away...but the piezo still buzzed.

Also, the Dell BIOS warned of "CPU FAN FAILURE" in August. I cleaned the fan blades and rinsed out the heatsink, but I left the original thermal paste(patchy and dried) between the CPU top and heatsink surface. Early this week, I tried fresh thermal paste, and also tried removing and reseating the CPU.

This also has Windows 10, with many upgrades, in 1/2 of the 500gb drive, because I have an old copy of Photoshop 7.0 that I use occasionally.

Thanks, and I really just wanted to understand the problem, because I've never wrecked a mainboard, nor a CPU, though the CPUs always had pins, rather than gold, (rounded rectangular?) spots(I think 1152 of those gold spots). I removed the CPU because I overdid the thermal paste.

The fan never stopped spinning, seemed to slow down normally. But I added some 15w 40 semi-synthetic motor oil(for an old Jeep), because my can of silicone spray is 100 miles away.

I was able to add the Optiplex's SATA drive to a (rival brand) ProDesk, and copy off some old files.

And I have Photoshop 7 installed on an old Windows XP system, that's just waiting for one of the new CR2032 batteries.

Photoshop 7 was an upgrade edition, installed over an original Photoshop 4, and I have copies of both CDs on a USB drive, with the serial numbers. The 2 Adobe CDs are 100 miles north.

And a seller on the New Zealand auction website has the Intel Core Duo E8400 CPU listed on a $1NZ (~70 US cents) reserve auction closing Monday, but he hasn't listed any motherboards.

Thanks for your answer.

Removing the battery, shorting the 2 mainboard pins labeled 'RTCRST', and also shorting the 2 pins at 90 angle to those pins, and holding the power button pressed for 30 seconds...I'd also removed and reinserted both 1GB sticks of DDR ram several times...finally produced 2 beeps from the system speaker(not the piezo sound device)....at the time of those 2 beeps, no video was connected, and no drives were attached. With video and keyboard connected, and hard drive attached, but still no battery, the BIOS displayed a 'low system voltage warning, but then continued to the GRUB2 menu, then to Debian Stretch, and later to Windows 10, which is only useful to me because I have a legal copy of Photoshop 7 installed.

Still, no one on Earth...not even Google...knows why the piezo, and not the system speaker, was making the buzzing sounds, which weren't beeps...more like 'buzz buzz...buzz buzz...buzz buzz...buzz buzz...buzz buzz...buzz buzz' followed only by the harmonics of the CPU fan and power supply fan.

Re: finally produced 2 beeps from the system speaker

good it sounds like PC was able to POST.  those are normal beeps of a happy system.

Re: no one ...knows why the piezo was making the buzzing sounds

consider it a normal aging electronics phenomenon.