PC will not boot after attempted RAM upgrade

"If the motherboard is a DP35DP, then 3 beeps is a memory error, as @abrsvc pointed out. The beep codes for your motherboard, what they mean, and what you can do about them can be found on a chart at:

https://www.intel.com/content/www/us/en/..."

"Hi,

Try a power refresh in case the BIOS has become corrupted for some reason.

Disconnect the power from the PC and then remove the coin cell battery from the motherboard. Remember the orientation, usually it is +ve on top.

Then press and hold the PC’s Power on button for a full 15 seconds and then release.

Reinsert the coin cell battery.

Only have memory in the 1st and 3rd slots as viewed from the CPU.

Reconnect the power and turn on the PC and check if it POSTs OK (Power On Self Test).

If it now starts OK, then turn off the PC and disconnect the power and then insert the other 2 ram modules, reconnect the power and check again

If still no good, turn off the PC and disconnect the power and remove the 2 ram modules from slot 1 & 3 and insert the other 2 ram modules into slots 1 & 3.

Note: There needs to be a ram module in Slot 1 as it won’t work at all without one being there"

"Hi David,

Further to the above suggestions from @abrsvc, @dancomptia and @jayeff, I had a look up online in relation to System Memory for Intel DP35DP. The article is given below.

System Memory for the Intel® Desktop Board DP35DP

According to the article, the maximum memory Intel DP35DP Board supports is 8GB (thought this might be helpful with regard to memory upgrade).

All the best!"