PC Beeping after BIOS splash screen and then turns off

JP_18

Reputable
Jan 25, 2016
3
0
4,520
I applied thermal paste to my old PC
This required me to take out the mobo since there's no much space inside my case
When I got everything back up again, my PC seemed to boot up like it should but after the BIOS splash screen it started beeping(like a siren) and the in turned off
Pls help, that PC is where I do my work,
 

JP_18

Reputable
Jan 25, 2016
3
0
4,520
None of those worked :( still doing that
BTW if it helps
Specs are
Intel Pentium D 820
ATI Radeon X1095
320Gb HDD
2Gb DDR2
I don't know which mobo that is
It's a Fujitsu Siemens Scaleo P PC