Issue installing new CPU- no monitor signal/bios on power up?

Hello all,
I recently purchased a second hand CPU I intended to replace my old one. Following manufacturer instructions, I uninstalled the previous processor and installed the new one, making sure to reapply thermal paste and secure the heatsink/fan (I recently upgraded the cooling system from stock parts, too).
After powering up, system light indicators were showing and the fans were online. There were no beeps from the computer and I was not able to get a monitor signal from either Graphics card or monitor slots. From previous threads, I'm assuming this is due to simply not being able to run BIOS.
I uninstalled the new CPU, checked that there were no bent pins in the CPU port and replaced my old CPU. The System works normally. I am fielding a guess based on other topics that my BIOS is simply out of date. I understand that installing BIOS is also very hazardous so I would like to be absolutely sure this is the issue before proceeding.
Old CPU: Intel Celeron E1200 1.6GHz
New CPU: Intel Core 2 Duo E8400 3GHz
Motherboard: ASUS P5KPL-VM
Chipset: Intel P35/G33/G31
BIOS: American Megatrends Inc. BIOS, version 0602 Date:12/12/2007
Graphics processor: AMD HD Radeon 6770
OS: Microsoft Windows XP Home Edition Service pack 3
HDDs: Hitachi HDS721616PLA380, ST380011A
Monitor: ACER AL1916W
Let me know if there's any other info I should post.

If it is the BIOS causing the issue, could someone please also advice me on installing an updated BIOS? There's a lot of intimidating talk about the process and I really don't want to make any mistakes.

Many thanks,
2 answers Last reply Best Answer
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  1. Best answer
    I would do a CMOS reset first. If that does not work, put your old CPU back in and then follow the instructions from Asus for updating the bios in your user manual. Just do a google search for your motherboard and you should get a link to your board on Asus's website to get the proper bios and any utilities you may need. You can also download the manual in case you do not have it.
  2. Installing an updated BIOS fixed the issue- however as a follow up, I got some weird problems when installing the CPU this time around. On startup, I was getting error messages of CPU temperature error in BIOS. Didn't seem right seeing as I recently installed a new cooling system too. I reapplied thermal paste and restarted. Restarted fully and checked readings in BIOS- CPU running at around 60C, checked with realtemp in windows after booting and Distance to TJmax is roughly 60C. Should I be concerned or is this just a one off?
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