Vostro 460, new motherboard, Manufacturing Mode, 4 beeps RAM

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manufacturing mode?  what in the world is this? ok,  jumpers set wrong, is my guess. Cntrol +F?

RTC coin cell if first to replace, on any PC this old , (that cell that old) do that or BIOS goes nuts,(chaos)

a 9year old PC (2010 with a 9year old coin cell is 3 years past end of life, (pink bunny rules) ok<

SO IS FIRST THINGS first and all MOBO I buy off fleabay are all like that EOL the $1 coin,  every time here.

do the long hard reset and OMG the Ethernet port wakes up, gee by golly wow,  zillions learned that.

off fleabay?   no source given for 2nd MoBo.

Vostro 460/Inspiron 8300:

the RAM marker, and DELL and intel (the made the MMC logic so they win all bets !!!) told you matched sets of DDR. intel even states matching SKU or system instability  can be your end results . take that as fact, it is their logic and nobody elses.  MMC is memory controller by intel.

The book on your PC at  dell.com covers all LED and Beep POST error codes, did you read that first?

learn this next on Ethernet (not just it , also USB ports)

Ethernet is wired,  and wired ports can  latch up, BUY DESIGN,  this is how it keeps from having REAL damage from ESD evens and for sure lightning or surges into your wired router,  in fact see that cable modem there.?

see that, that is in fact a lightning CONDUIT, to your home. (i have 2 ground stakes on my home to end that)

ask how can tell ,

The chip makers do that, prevents ON DIE damage from surges up to 25,000 volts, (tell me die I tell you spec)

• They do that with a special port clamping device, on die, the SEE the event and shorts its own input to end damgge( in the old days we called this a crow bar clamp)

we call that latch up. (there is also a CMOS parasitic latch up condition too , they avoid that. too)

so learn this fact now.

if you work on PC, learn how to get all capacitors 99% discharged below 0.3 volts,  less is better

and that ACT by  any tech, does a hard cold reset,  ZERO POWER AC, and DC< and forces these to 0v.

Seen vast MOBO latch up in 46 years on the job. and (PC now and vast real computers, 1974 to now)

the old systems (mainframes to mini's) just blew up;., not now the magic of ESD  protection.

in a rush?  I even go HARD BALL.

• Long hard reset 1,2,3,4, above and leave it dead. (AC power not connected NOW) fails. darn.
• PSU unplugged from mobo. from 4pin and 24pin.
• then let both sit for 1hour, this trick here prevents PSU caps inside it from holding the chips on MoBo latched up. (some PCs and some MOBO can be stubborn. 1 in 10? IDK but is REAL.
• let it sit 1hour or using a ground rod probe use its tip to ground out all power pins on the MOBO,  now and only now will you know if the MOBO was ok,  later as you restore all the above to normal. Go for 0vdc.
• now do not bend the CPU socket pins as most NOOB's do, watch the intel video on how not to do that.
• do not hot plug anything inside any PC. ok, or you will blow stuff Up I promise.
• Do not hot plug ram, ok,  or they burn up.
• In the extremes on rare cases, I remove the MOBO and in hand lay it on wifes aluminum foil, and now this  mOBO is at 0vdc,  for sure, no guessing no more latchup, possible  1 in 100 cases,  or level PC unplugged from wall for 24hours,  if lots of free time can work, I just do what it NEEDs, and fast . time is money working. (with a life time of mobo swaps one learns these ropes or go mad quick, )
• the better your CAPS are the worst this gets, holding charge so (too) well... that too....